Optimization of Conjugated-Polymer-Based Bulk Heterojunctions
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1 ptimization of Conjugated-Polymer-Based Bulk Heterojunctions J.C. (Kees) Hummelen Molecular Electronics Materials Science Centre Plus University of Groningen, The Netherlands GCEP Solar Energy Workshop ct , 2004 Stanford University
2 ~ 20 nm ~ 500 nm SUBSTRATE Al CPC BLEND TC Introduction, Morphology, Mobilities, Improving V oc, Improving I sc, - N.S.Sariciftci, A.J. Heeger, USPatents 1992/ G. Yu, J. Gao, J.C. Hummelen, F. Wudl, A.J. Heeger, Science 270, (1995) - S. E. Shaheen, C. J. Brabec, F. Padinger, T. Fromherz, J. C. Hummelen, N. S. Sariciftci, Appl. Phys.Lett. 78, 841 (2001).
3 pening the box of Pandora: from bilayer to mixture p/n p:n metal top electrode transparent bottom electrode glass - D A Light G. Yu, J. Gao, J.C. Hummelen, F. Wudl, A.J. Heeger, Science 270, 1789 (1995)
4 Basic processes in a PV cell h+ eexc Electrode 1 ito n Electrode 2 Light
5 Commonly used PPVs EH MEH-PPV M DM MDM-PPV (C 1 C 10 PPV) M
6 The standard fullerene acceptor Microsoft owerpoint Presentatio PCBM A highly processable methanofullerene (50-80 weight % of the D:A blend!) Available from Nano-C Inc. (Westwood, Mass) nano-c.com
7 PCBM (PhCl) crystal structure Fullerene moieties at < 10 Å in THREE dimensions Spheres: orientation always K! M.T. Rispens, A. Meetsma, R. Rittberger, C.J. Brabec, N.S. Sariciftci, J.C. Hummelen, Chem. Commun (2003)
8 SCLC: Experimental and calculated (solid lines) J-V characteristics of IT/PEDT:PSS/PCBM/LiF/Al devices with thicknesses L=90 nm and 170 nm (symbols),using V bi =1.4 ev and V Rs =30 Ω The device band diagram is indicated in the inset. The electron transport is described by SCLC, with an electron mobility µ e= m 2 /Vs and a dielectric constant ε r =3.9. Charge carrier mobility in PCBM (MDM-PPV: holes µ h = cm 2 /Vs) PCBM: electrons µ e = cm 2 /Vs (C 60 films: cm 2 /Vs ; C 60 single crystals: 0.5 cm 2 /Vs) Mobility measurements on PCBM films i.e. PCBM does 4000 times better than MDM-PPV! Average hopping distance in PCBM ~ 3 nm! Mihailetchi, van Duren, Blom, Hummelen, Janssen, Kroon, Rispens, Verhees, Wienk, Adv. Funct. Mat. 13, (2003)
9 Charge carrier mobility in blend µ [m 2 /Vs] T=295K µ e µ h µ h pure MDM-PPV weight percentage PCBM [wt.-%] enhanced intermolecular interaction by adding PCBM. MDM-PPV MDM-PPV:PCBM C. Melzer et al., Adv. Funct. Mat., (accepted) M. Kemerink et al., Nano Lett., 2003,3, 1191 electron mobility increases due to the increase number of percolated pathways. more balanced transport: µ e 10 µ h.
10 Morphology: influence of spin cast solvent: a from toluene MDM-PPV:PCBM from chlorobenzene b 0.5 µm 0.5 µm Surface Height (nm) Distance (µm) Surface Height (nm) Distance (µm)
11 Morphology: influence of spin cast solvent: 0 Active layer PEDT LiF Aluminum Glass IT - SMU + Current Density (ma/cm 2 ) from toluene from chlorobenzene Voltage (V) S. E. Shaheen, C. J. Brabec, F. Padinger, T. Fromherz, J. C. Hummelen, N. S. Sariciftci, Appl. Phys.Lett. 78, (2001).
12 Morphology control: compatibilizing with the PCBX series PCBM PCBE PCBPr PCBEH PCBDM H
13 Dropcasting using different acceptors Gilch-PPV/PCBM Toluene 1:4 Gilch-PPV/PCBDM Toluene 1: TEM Unfiltered T. Martens, Z. Beelen, J. D Haen, J. Manca, IMEC
14 Dropcasting using different acceptors Gilch-PPV/PCBM Chlorobenzene 1: Gilch-PPV/PCBDM Chlorobenzene 1: T. Martens, Z. Beelen, J. D Haen, J. Manca, IMEC TEM Unfiltered
15 The photoinduced LUM-LUM electron transfer process (from excited donor) Light E ref LUM HM V oc(max) D A Anode Cathode
16 Improving V oc E ref V oc(max) D A Anode Cathode is there some truth in this picture?
17 Soluble fullerene derivatives with varying acceptor strength N N PCBM-[6,6] EH-Azafulleroid-[5,6] EH-Ketolactam
18 PCBM E red tuning CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 Joop Knol, Floris Kooistra
19 V oc versus E red acceptor in MDM-PPV/acceptor cells (CB) ,3,4-(Me) 3 PCBM 3,4-(Me). 2 PCBM, TCBM PCBM PCBM V oc 700 AF C KL E red vs Fc/Fc +
20 Higher fullerenes: [70]PCBM M.M. Wienk, J. M. Kroon, W. J. H. Verhees, J. Knol, J. C. Hummelen, P. A. van Hal, and R. A. J. Janssen, Angew. Chemie 42, (2003)
21 The photoinduced HM-HM electron transfer process (to excited acceptor) E vac LUM Light V oc(max) HM D A Anode ~ hole transfer Cathode
22 IPR Fullerenes C 60 -C 80 (calculated)
23 UV-Vis spectrum of [60]PCBM 50 extinction coefficient / L -1 g cm wavelength / nm
24 Synthesis of [70]PCBM Me NNHTs base, C 70 DCB Me + + Me Me 85 % 15 % (chiral)
25 UV-Vis spectra of [60]PCBM and [70]PCBM 50 extinction coefficient / L -1 g cm wavelength / nm [60]PCBM:MDM-PPV (4:1, w/w) and [70]PCBM:MDM-PPV (4:1, w/w) (normalized) All in toluene
26 PL decay of the fullerene emission at 720 nm of [70]PCBM:MDM-PPV (4:1 w/w) films Counts PL quenching: 0, 30, 60, 95 % Time / ns Spun from chlorobenzene, o-xylene, and DCB. Yellow: pristine [70]PCBM film
27 AFM tapping mode height images [70]PCBM:MDM-PPV (4:1 w/w) films on glass CB z-range = 86 nm rms roughness = 12 nm o-xylene z-range = 37 nm rms roughness = 7 nm DCB z-range = 8.2 nm rms roughness = 1.0 nm Counts Time / ns
28 Spectral response (EQE) of IT/PEDT-PSS/fullerene:MDM-PPV/LiF/Al cells EQE wavelength / nm [70]PCBM:MDM-PPV cells, spun from CB and DCB [60]PCBM: MDM-PPV cell spun from CB; active areas = 0.1 cm 2
29 I / V characteristics of [70]PCBM:MDM-PPV devices Current Density / macm E-3 1E V C = 0.77 V I SC = 7.6 ma/cm 2 FF = 0.51 η = 3.0 % M.M. Wienk, J. M. Kroon, W. J. H. Verhees, J. Knol, J. C. Hummelen, P. A. van Hal, and R. A. J. Janssen, Angew. Chemie 42, (2003) Voltage / V [70]PCBM Available from Nano-C Inc. (Westwood, Mass) nano-c.com
30 Morphology of the bulk heterojunction Formation phases, domain sizes, percolation, wetting, processing, annealing, thickness Efficiency exciton diffusion, charge separation, charge recombination, (balanced) mobilities Stability phase separation (crystallization), (photo-)chemistry
31 Some provoking remarks No theoretical grounds for inferior efficieny of molecular devices Higher efficiency => improved stability Molecular materials offer infinite architectural opportunities (even for 3 rd generation tricks) General: 225M$ is very attractive! Beware of groups that not have a real focus on sustainable energy? (PV in this case)
32 Joop Knol Minze T. Rispens Floris Kooistra Luis Sanchez Jan Alma Patrick van t Hof Valentin Mihailetchi Paul Blom (RuG) Paul van Hal René Janssen (TU/e) Acknowledgments Acknowledgments Jan M. Kroon Wiljan Verhees Martijn Wienk (ECN) Christoph Brabec (now Siemens/Konarka) Serdar Sariciftci (Uni Linz) David Kronholm Henning Richter (Nano-C) Novem (The Netherlands rganization for Energy and the Environment) E.E.T. ( Economy, Ecology, Technology by Dutch EZ, C&W, VRM depts)
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