Supporting Information Modulation of PEDOT:PSS ph for Efficient Inverted Perovskite Solar Cells with Reduced Potential Loss and Enhanced Stability Qin Wang 1,2, Chu-Chen Chueh 1, Morteza Eslamian 2 * and Alex K.-Y. Jen 1 * 1 Q. Wang, Dr. C.-C. Chueh, Prof. A. K.-Y. Jen Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98105, USA. E-mail: ajen@u.washington.edu 2 Q. Wang, Prof. M. Eslamian University of Michigan Shanghai Jiao Tong University Joint Institute, Shanghai, 200240, China. E-mail: Morteza.Eslamian@sjtu.edu.cn KEYWORDS: PEDOT:PSS, ph, potential loss, environmental stability, perovskite solar cells S-1
Figure S1. Contact angle images of a-, n-, and b-pedot:pss solution droplets on glass substrate. Figure S2. SEM images of a-, n-, and b-pedot:pss films at two magnifications: (a) 20,000X and (b) 50,000X. S-2
Figure S3. (a) N(1s) spectrum, (b) S(2p) spectrum and (c) O(1s) spectrum of a-, n-, and b-pedot:pss films. S-3
Figure S4. UV-vis absorption spectra of CH 3 NH 3 PbI 3 deposited on a-, n-, and b-pedot:pss films. Figure S5. Steady-state PL spectra of perovskite layers deposited on a-, n-, and b-pedot:pss films. S-4
Figure S6. J-V curves of b-pedot:pss PVSC device measured under forward scan (0 V~ 1.1 V) and reverse scan (1.1 V~0 V) at a scan rate of 0.1 V s -1. S-5
Figure S7. Illustration of the data in Table S1, summary of literature data on the performance of inverted PVSCs using PEDOT:PSS HTLs. The black square symbols represent the MAPbI 3 system, while the green circles represent the MAPbI 3-x Cl x system. In this work, MAPbI 3 system was used (Star shape). Devices fell in the hatched area show superior performance with a low potential loss (< 0.5V) and a high efficiency (>15%). MA stands for methylammonium.. S-6
Table S1. Literature summary of the perofrmance of inverted PVSCs using PEDOT:PSS HTLs. The (*) behind the device architechture represents the MAPbI 3-x Cl x system while the structure without (*) represents MAPbI 3 system. Our work is shown last one which belongs to MAPbI 3 system. Device architecture V oc (V) J sc [ma cm -2 ] FF (%) PCE (%) Remarks Referenc e ITO/PEDOT: PSS/HSL/MAPbI 3-xCl x/pcb M/PN4N/Ag (*) ITO/SOHEL/ MAPbI 3/PCBM/Al ITO/PEDOT: PSS-g-PANI:PFI/ MAPbI 3/PCBM/Al ITO/SOHEL4/ MAPbI 3/PCBM/Al ITO/PEDOT: PSS (1:20)/ MAPbI 3/PCBM/Ag ITO/1%PEDOT: PSS+NiO x/ MAPbI 3/PCBM/Ag 1.07 20.4 75.9 16.6 Synthesizing new polymeric hole selective layer; Bilayer HTL; 1.04 15.5 49.9 8.0 Self-organized HTL with high work function by tuning PFI/PEDOT: PSS weight ratio 1.07 14.9 77.6 12.4 Self-doped HTL 1.04 16.5 74.3 11.7 Universal energy level tailoring of a self-organized HTL 0.91 19.9 69.9 12.0 Tuning the work function of HTL by tuning the ratio of PEDOT and PSS 1.04 20.1 73.0 15.1 Hybrid layer for the HTL [1] [2] [3] [4] [5] [6] ITO/PEDOT: PSS-H(high conductivity) / MAPbI 3/PCBM/Al ITO/ 1%MoO 3+PEDOT: PSS/ MAPbI 3/C 60/Bphen/Ag 0.83 16.44 75.0 10.23 Tuning the conductivity of HTL 1.00 21.5 69.0 14.9 Using bilayer to increase the stability [7] [8] ITO/Sulfonated Lignin Doped PEDOT/MAPbI 3/PCBM/Ag ITO/PEDOT: PSS+0.05%wt Ag NPs/ MAPbI 3-xCl x/pcbm/bphen/a g (*) ITO/PEO doped PEDOT: PSS/ MAPbI 3/PCBM/Al 1.03 20.1 72.3 14.9 Using high-value-added lignin to replace the PSS part 0.93 21.5 79.0 15.7 Applying Ag NPs to improve the conductivity 0.88 23.4 80.1 16.5 Improve the HTL conductivity by doping [9] [10] [11] ITO/PEDOT: PSS/perylene/MAPbI 3-xCl x/ PCBM/Bphen/Ag (*) ITO/ultrasonic treated PEDOT: PSS/MAPbI 3-xCl x/rhodamine 101/C 60/LiF/Ag (*) ITO/b-PEDOT: PSS/ MAPbI 3/PCBM/bis-C 60/Ag 0.98 22.6 77.0 17.1 Perylene-Induced crystallization 1.00 15.1 79 12.0 Physical method to increase the ph of PEDOT: PSS 1.06 19.1 77.0 15.7 ph induced potential loss minimization and stability and efficiency enhancement [12] [13] Our work S-7
Figure S8. XPS spectra of a-pedot: PSS, n-pedot: PSS and b-pedot: PSS thin films after three days. Table S2. Atomic concentration of indium diffused into PEDOT:PSS with different ph. Measurement were performed after three days. HTLs a-pedot: PSS n-pedot: PSS b-pedot: PSS Indium atomic concentration (%) 14.35 0.26 0.09 S-8
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