School of Materials Science & Engineering, Xi'an Jiaotong University, No.28, Xianning West Road, Xi'an, Shaanxi, , P.R. China.
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1 Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2018 SUPPORTING INFORMATION Low-temperature SnO 2 -modified TiO 2 yields record efficiency for normal planar perovskite solar modules Bin Ding, Shi-Yu Huang, Qian-Qian Chu, Yan Li, Cheng-Xin Li, Chang-Jiu Li and Guan-Jun Yang* School of Materials Science & Engineering, Xi'an Jiaotong University, No.28, Xianning West Road, Xi'an, Shaanxi, , P.R. China. Corresponding author: G.-J. Yang, ygj@mail.xjtu.edu.cn.
2 Experimental section N, N-dimethylformamide (DMF), titanium tetrachloride (TiCl 4 ), and stannous chloride dehydrate (SnCl 2 2H 2 O) were purchased from Sinopharm Chemical Reagent Co., Ltd (China). Methylammonium iodide (CH 3 NH 3 I, MAI), formamidinium iodide (HC(NH 2 ) 2 I, FAI), lead iodide (PbI 2 ), and other chemicals for the preparation of Spiro-OMeTAD solution were purchased from Xi'an Polymer Light Technology Corp. (China). The transparent fluorine-doped tin oxide (SnO 2 :F, FTO) conductive glasses (sheet resistance of 10 Ω sq -1 ) were patterned by laser from Weihua Solar Company (China). Fabrication of TiO 2 compact layer The FTO glass substrates were sequentially cleaned using acetone, ethanol, and deionized water for 15 min via ultrasonic cleaning. The 2M aqueous TiCl 4 solution was firstly prepared by mixing TiCl 4 with deionized water at 0 C and then stored in a freezer at the temperature of 5 C, which remains stable for at least one year. The cleaned FTO substrate was soaked in the dilute 2M aqueous TiCl 4 solution, obtained by mixing 2M aqueous TiCl 4 solution and deionized water with the molar ratio of 1:10 and placed in a sealed glass container. Then the glass container was put in a drying cabinet at the temperature of 70 C for 1 h. After cooling, the FTO substrate was repeatedly rinsed using ethanol and deionized water for three time, and dried at 120 C for 1 h. The substrate was then treated at 70 C for 30 min with the solution prepared by 2M aqueous TiCl 4 solution and deionized water with the molar ratio of 1:100. Finally the substrate was rinsed and dried by repeating the abovementioned
3 process. Fabrication of SnO 2 modified TiO 2 (SnO 2 ) compact layer 2M SnCl 2 ethanol solution was firstly prepared by using SnCl 2 2H 2 O dissolved in ethanol and then stored in the freezer at 5 C. The FTO substrate coated with TiO 2 nanoparticles by the abovementioned chemical bath was soaked in the solution obtained by mixing 2M SnCl 2 ethanol with deionized water with the molar ratio of 1:50 in a glass container. Then the glass container was placed in a drying cabinet at the temperature of 70 C for 1 h. After cooling, the FTO substrate was repeatedly rinsed using ethanol and deionized water for three times. Finally the substrate was annealed on a hotplate at 140 C for 3h. Fabrication of perovskite films and solar cells The FTO substrate coated with the compact layer (TiO 2 or SnO 2 ) was firstly cleaned by UV-ozone for 15 min. A 40 wt % perovskite precursor solution was prepared with molar ratios of PbI 2 /MAI/FAI fixed at 1:0.7:0.3 in DMF. The perovskite films were deposited onto the TiO 2 or SnO 2 substrates by using our previously reported approach called gas-induced gas pump method. 1 First, the perovskite precursor solution was spin-coated onto the substrate at 2500 rpm for 10 s. Then, the substrate was put into a gas pump system equipment. The gas pump equipment was home-developed, mainly composed of a large vacuum tank and a sample chamber. The vacuum tank maintaining at a constant pressure of 1500 Pa in this work and sample chamber was connected with each other by a vacuum valve. At the bottom, the sample chamber was attached to air by two symmetrical gas tubes further connecting
4 a gas flow controller, which allowing a certain amount of air flowing on the surface of the wet perovskite film. After opening the valve, the DMF solvent evaporated instantaneously. About 5 s later, closing the valve, a brown, somewhat transparent perovskite film with a mirror-like surface was obtained. Subsequently, the film was annealed at 120 C for 20 min on a hot plate. Then the Spiro-OMeTAD solution (80 mg of Spiro-OMeTAD, 28.5 μl of 4-tert-butylpyridine, and 17.5 μl lithium-bis(trifluoromethanesulfonyl)imide (Li-TFSI) solution (520 mg Li-TFSI) in 1mL acetonitrile) all dissolved in 1 ml of chlorobenzene) was spin-coated onto the perovskite film by spin-coating at 4000 rpm for 30 s. The Spiro-OMeTAD-coated substrates were stored in an auto-drying cabinet with temperature fixed at 20 C and relative humidity fixed at 15% for at least 8h. Finally, about100 nm thick gold layer was deposited onto the Spiro-OMeTAD layer by thermal evaporation. As for the solar module, after the substrate coated with Spiro-OMeTAD, the Sipro-OMeTAD/perovskite on the non-device area was removed by DMF solvent in order to forming a parallel module using the gold layer. All the films except gold layer were prepared in air at the temperature of 22~25 C and the relative humidity of 45~55 %. Solar cell characterization Photocurrent-voltage (J-V) characteristics of the devices were measured by applying a sourcemeter (2400, Keithley) under the illumination of the solar simulator (Newport, Class AAA) with an AM 1.5G filter (Sol3A, Oriel) at the light intensity of 100 mw cm -2 calibrated with a standard Si reference cell (91150V, Oriel). After being taken out
5 of the chamber of the thermal evaporation, the devices were put in an auto-drying cabinet for at least 4 h and then were directly measured. Normally, the devices were measured at a scan step of about 23.7 mv (60 points in total) and a delay time of 1000 ms at the bias voltage range of -0.2 V to 1.2 V. For the champion cells, the devices was also measured at different delay time, such as 100, 500,1000, and 1500 ms. For the solar modules, the devices were measured at the scan step of 10 mv and the delay time of 50 ms. For the measurement of the maximum power point tracking in air, the device was tested for 14 hours under the illumination of the solar simulator (Newport, Class AAA) with an AM 1.5G filter (Sol3A, Oriel) at the light intensity of 100 mw cm -2 calibrated with a standard Si reference cell (91150V, Oriel) with relative humidity of 45%-55%. The current was updated every 4 s. For the measurement in ideal conditions, the device was tested under continuous AM 1.5G illumination with intensity of one sun from another solar simulator (CHF-XM500, Beijing perfectlight technology co. LTD) equipped with a 420-nm cutoff UV-filter. The device was kept in a sealed home-made steel box with a quartz glass window during the whole test. The box containing the devices was purged with nitrogen flow for 3 hours to get rid of water and oxygen in the whole space. The current-voltage characteristics were obtained every 24 hour. The incident photon-to-current conversion efficiency (IPCE) was measured by Enli tech (Taiwan) measurement system in AC mode in air without encapsulating the devices. A home-developed system was applied to measure the transient photovoltage and photocurrent decays. A white light bias with adjustable light intensity was
6 generated from an array of diodes. The voltage bias was maintained at open-circuit voltage (V OC ) by turning the intensity of the white light bias. The perturbation light was generated from red light pulse diodes controlled by a fast solid-state switch with a square pulse width, 100 ns rise and fall time. The intensity of perturbation light was adjusted to a suitably amplitude of transient V OC below 5 mv in order for the voltage decay kinetics to be mono-exponential. For the photovoltage decay measurement, the open circuit condition was achieved by using a resistor of 5 MΩ controlled by a resistance box. Similarly, the short circuit condition was achieved by using a 90 Ωresistor for the photocurrent decay measurement. The voltage dynamics were recorded on a digital oscilloscope. The electrochemical impedance spectroscopy of the perovskite devices was measured by using an electrochemical system (EIS, Zennium IM6, Zahner). The devices were measured at the bias voltage from -0.7 V to -1.0 V with step of 0.1 V and at a frequency ranging from 3 MHz to 100 mhz with an AC amplitude of 20 mv under a LED light with the intensity of 10 mw/cm 2. Film characterizations Field-emission scanning electron microscope (SEM, FEI Verios 460) was used to characterize the surface and fracture morphologies of the ETLs, perovskite films and PSCs. By using an ultraviolet-visible spectrophotometer (U-3900, HITACHI), the transmittance spectra of the ETLs on the FTO substrates were measured by using a glass substrate that has the same thickness as the FTO substrate as the background data and the absorption spectra of the perovskite films were measured by using a FTO substrate as the background data. X-ray diffraction (XRD, D8 Advance, Bruker) was
7 used to characterize the phase composition of the ETLs and perovskite films with a scanning range of and a scanning speed of 0.05 /s. X-ray photoelectron spectroscopy (XPS) was measured using a Thermo Scientific ESCALab 250Xi with 200W monochromated Al Kα (1,486.6eV) radiation. XPS analysis was conducted with a 500 μm spot size, 20 ev pass energy and energy steps of 0.05 ev at the pressure of mbar. For the steady-state photoluminescence spectra measurement, a compact steady-state spectrophotometer (Fluoromax-4, Horiba Jobin Yvon) was used with the laser diode at a wavelength of 457 nm. A LabRAM HR800 (Horiba Jobin Yvon) was implied to measure the time-resolved photoluminescence (TRPL) measurements of perovskite films on different substrates at 786 nm using an excitation with a 478 nm light pulse from a HORIBA Scientific DeltaPro fluorimeter. The electron diffusion coefficient was estimated by fitting TRPL with equation S1. 2,3 ( ) = exp ( ) (exp ( ( + ) ) ( ) ( ) (( ) ( ) ) ) (S1) wherer N(t) is the total charge number generated in the active layer, L is the thickness of the active layer, k is the TRPL decay rate without any acceptor layer, D is the charge-carrier diffusion coefficient and α is the linear absorption coefficient of the active layer at the excitation wavelength. The cross-sectional sample of the perovskite film deposited on the SnO 2 /FTO glass substrate was prepared by using FEI Helios Nanolab 600i FIB-SEM system. The sample was firstly coated with Cr layer by Gantan 682 and then was coated with two layers of Pt by electron beam deposition followed by Ion beam deposition. Finally, the sample was cut by Ga beam at a voltage of 30 kv with
8 the cross-section at a tilted angle of 52 relative to the Ga ion sputtering direction. Supplementary Figures and Tables Fig. S1 XPS, XRD and UV-vis characterization. (a) Survey scan XPS spectra and (b) XRD patterns of FTO, TiO 2 /FTO and SnO 2 deposited on TiO 2 /FTO substrates annealed at 80, 140 as well as 180 C. (c) Transmission spectra of FTO substrates with and without the TiO 2 film or the SnO 2 film. (d) I-V curves of the FTO/ETL/Au devices with fixed area based on the TiO 2 (T) and SnO 2 (S@T) ETL.
9 Fig. S2 SEM images of perovskite films morphologies. Top-view images of perovskite films deposited on TiO2 with low (a) and (c) high magnifications or with (b) low and high (d) magnification. The corresponding cross-sectional view images of perovskite films deposited on TiO2 (e and g) or on (f and h).
10 Fig. S3 XRD patterns of perovskite films deposited on TiO 2 or SnO 2 with heat treatment (W/ HT) and without heat treatment (W/O HT). The perovskite films were annealed at 120 C for 20 mins.
11 Fig. S4 Characterization of TEM. (a) High angle annular dark field (HAADF) scanning cross-sectional view TEM image of the perovskite film deposited on the SnO 2 /FTO substrate obtained by using FIB. (b) HAADF scanning TEM image of the enlarged FTO/ SnO 2 /perovskite interfaces. Individual elemental maps of (c) C, (d) N, (e) I, and (f) Pb of the area indicated by the white box in Fig. 3b. (g) HAADF scanning TEM image of the enlarged FTO/SnO 2 /perovskite interfaces with high magnification. The energy dispersive spectra of the point 1 (h) and 2 (i) indicated by the plus signs in Fig. S4g.
12 Fig. S5 SEM images of planar perovskite solar cells. Cross-view images of the TiO 2 -based device with low (a) and (c) high magnification and the SnO 2 -based device with (b) low and high (d) magnification.
13 Fig. S6 Device with 0.1 cm 2 masked area performance. (a) J-V curves (reverse scan) of the planar perovskite solar cells based on TiO 2 films treated by different concentration SnCl 2 solution via chemical bath. Photovoltaic parameters (b) J SC, (c) V OC and (d) FF for perovskite solar cells based on TiO 2 or SnO 2 ETLs. (e) The output of current density and the corresponding PCE at the maximum power point with bias voltage of 975 mv for the SnO 2 -based champion cell as shown in Fig. 4d. (f) IPCE spectra of the champion cells with TiO 2 (Fig. 4c) and SnO 2 (Fig. 4d) ETLs.
14 Fig. S7 The characteristics of impedance spectroscopy of the devices based on TiO 2 and SnO 2 ETLs. (a) The equivalent circuit consisting of a resistance and two lumped RC elements in series to fit the impedance data. (b) The Nyquist plots of the device based the TiO 2 ETL at different bias voltages. (c) The Nyquist plots of the device based the SnO 2 ETL at different bias voltages. (d) The series resistance (R S ), (e) the charge transfer resistance (R CT ), and (f) the charge recombination resistance (R CR ).
15 Fig. S8 device with active area of 1.13 cm 2 performance. Photovoltaic parameters (a) J SC, (b) V OC and (c) FF for 1.13 cm 2 perovskite solar cells based on SnO 2 ETLs. (d) The output of current density and the corresponding PCE at the maximum power point with bias voltage of 939 mv for the SnO 2 -based champion cell with active area of 1.13 cm 2 as shown in Fig. 5b.
16 Fig. S9 The illustration and photographs of the mini-module. (a) The size of the module in detail. (b) The photograph of the module from the Au side. (c) The photograph of the module from the FTO side which is the light incident surface.
17 Fig. S10 (a) The photograph of the modules on the cm substrates from Au side. (b) The photograph of the module from the FTO side which is the light incident surface.
18 Fig. S11 The certified result of the normal planar perovskite solar module. The device has a masked area of cm 2 and an average PCE of 15.65% (V OC =5.25 V, I SC =45.58 macm -2, and FF=69.0%) with less hysteresis.
19 Fig. S12 The certified results of the normal planar perovskite solar module in Fig. S17 at (a) reverse scan (PCE=15.87%, V OC =5.25 V, I SC =45.41 ma/cm 2 and FF= 70.20%) and (b) forward scan (PCE=15.43%, V OC =5.26 V, I SC =45.75 ma/cm 2 and FF= 67.70%).
20 Fig. S13. Normalized EQE spectra of the certified solar module with the integrated short circuit current density of ma/cm 2.
21 Fig. S14 (a) Sol3A Class A spectral distribution and (b) EQE of Newport secondary solar cell KG1 for the certification body.
22 Table S1 Photovoltaic parameters of the planar perovskite solar cells based on TiO 2 films treated by different concentration of SnCl 2 solution via chemical bath. Concentration (mm) J SC (ma/cm 2 ) V OC (mv) FF (%) PCE (%) Table S2 Photovoltaic parameters of the TiO 2 -based champion cell. The device was measured by reverse and forward scans at a scan step of 23.7 mv and delay time of 100, 500, 1000 as well as 1500 ms under a simulated AM 1.5G solar illumination of 100 mw/cm 2. Scan direction Delay time (ms) J SC (ma/cm 2 ) V OC (mv) FF (%) PCE (%) Forward Reverse Forward Reverse Forward Reverse Forward Reverse
23 Table S3 Photovoltaic parameters of the SnO 2 -based champion cell. The device was measured by reverse and forward scans at a scan step of 23.7 mv and delay time of 100, 500, 1000 as well as 1500 ms under a simulated AM 1.5G solar illumination of 100 mw/cm 2. Scan direction Delay time (ms) J SC (ma/cm 2 ) V OC (mv) FF (%) PCE (%) Forward Reverse Forward Reverse Forward Reverse Forward Reverse Notes and references 1 B. Ding, Y. Li, S. -Y. Huang, Q. -Q. Chu, C. -X. Li, C. -J. Li, G. -J. Yang, J. Mater. Chem. A, 2017, 5, S. D. Stranks, G. E. Eperon, G. Grancini, C. Menelaou, M. J. P. Alcocer, T. Leijtens, L. M. Herz, A. Petrozza, H. J. Snaith, Science, 2013, 342, G. Xing, N. Mathews, S. Sun, S. S. Lim, Y. M. Lam, M. Gratzel, S. Mhaisalkar, T. C. Sum, Science, 2013, 342,
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