Abstract
This paper presents recent experimental and theoretical approaches for optimizing organic solar cell efficiencies in both space and energy/time domains. Specifically, in spatial domain, a ‘tertiary’ block copolymer supra-molecular nano structure has been designed, and a series of –DBAB- type of block copolymers, where D is a conjugated donor block, A is a conjugated acceptor block, and B is a non-conjugated and flexible bridge unit, have been synthesized and preliminarily examined for target photovoltaic functions. For instance, in comparison to simple donor/acceptor (D/A) blend film, a corresponding –DBAB- block copolymer film exhibited much better photoluminescence (PL) quenching (from less then 70% to over 90%), biased conductivity (2–3 orders of magnitude better), and photo conductivity (100% increase). These are attributed mainly to spatial domain improvement for charge carrier generation and transportation. In energy level domain, the photo induced charge separation appears most efficient when the donor/acceptor frontier orbital energy offset is close to the sum of two major energy costs: the charge separation reorganization energy and the exciton binding energy. Other donor/acceptor frontier orbital energy offsets are also identified where the charge recombination becomes most severe, and where the charge separation rate constant over charge recombination rate constant become largest. These energy offset values are very critical for designing high efficiency organic solar cells.
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M. D. ARCHER, AND R. HILL (EDS.), “CLEAN ELECTRICITY FROM PHOTOVOLTAICS” (IMPERIAL COLLEGE PRESS, LONDON, 2001).
S. SUN, AND N. S. SARICIFTCI (EDS.), “ORGANIC PHOTOVOLTAICS: MECHANISMS, MATERIALS AND DEVICES” (CRC PRESS, BOCA RATON, FL, 2005).
Z. KAFAFI, AND P. LANE (EDS.), “ORGANIC PHOTOVOLTAICS IV” (SPIE, BELLINGHAM, 2004).
C. BRABEC, V. DYAKONOV, J. PARISI, AND N. SARICIFTCI, “ORGANIC PHOTOVOLTAICS: CONCEPTS AND REALIZATION” (SPRINGER, BERLIN, 2003).
A. HAGFELDT, AND M. GRAETZEL., Acct. Chem. Res. 33 (2000) 269.
C. TANG, Appl. Phys. Lett. 48 (1986) 183.
N. S. SARICIFTCI, L. SMILOWITZ, A. J. HEEGER, AND F. WUDL, Science 258 (1992) 1474.
B. KRAABEL, J. HUMMELEN, D. VACAR, D. MOSES, N. SARICIFTCI, A. HEEGER, AND F. WUDL, J. Chem. Phys. 104 (1996) 4267.
G. YU, J. GAO, J. HUMMELEN, F. WUDL, AND A. HEEGER, Science 270 (1995) 1789.
L. SCHMIDT-MENDE, A. FECHTENKÖTTER, K. MÜLLEN, E. MOONS, R. H. FRIEND, and J. D. MACKENZIE, Science 293 (2001) 1119.
M. GRANSTROM, K. PETRITSCH, A. ARIAS, A. LUX, M., ANDERSSON, and R. FRIEND, Nature 395 (1998) 257.
L. S. ROMAN, M. ANDERSON, T. YOHANNES, and O. INGANAS, Adv. Mater 9 (1997)1164.
B. BOER, U. STALMACH, P. HUTTEN, C. MELZER, V. KRASNIKOV, and G. HADZIIOANNOU, Polymer 42 (2001) 9097.
S. SUN, Sol. Energy Mat. Sol. Cells 79 (2003) 257.
T. A. SKOTHEIM, R. L. ELSENBAUMER, and J. R. REYNOLDS, (eds.), “Handbook of Conducting Polymers,” 2nd ed. (Marcel Dekker, New York, 1998).
J. PERLIN, “From Space to Earth-The story of Solar Electricity” (AATEC Publications, Ann Arbor, Michigan, 1999).
M. KNUPFER, Appl. Phys. A 77 (2003) 623.
T. STUBINGER, and W. BRUTTING, J. Appl. Phys. 90 (2001) 3632.
H. AMERONGEN, L. VALKUNAS, and R. GRONDELLE (eds.), “Photosynthetic Excitons” (World Scientific, Singapore, 2000).
C. BRABEC, Et Al., Adv. Funct. Mater. 11 (2001) 374.
C. BRABEC, C. WINDER, N. SARICIFTCI, J. HUMMELEN, A. DHANABALAN, P. HAL, and R. JANSSEN, 12 (2002) 709.
N. SARICIFTCI, Et Al., J. Poly. Sci., A. 41 (2003) 1034.
V. SESHADRI, and G. SOTZING, in “Organic Photovoltaics: Mechanisms, Materials and Devices,” edited by, S. Sun and N. S. Sariciftci, (eds.), (CRC Press, Boca Raton, FL, 2005).
B. GREGG, J. Phys. Chem. B. 107 (2003) 4688.
N. HADJICHRISTIDIS, S. PISPAS, and G. FLOUDAS (eds.), “Block Copolymers: Synthetic Strategies, Physical Properties, and Applications” (John Wiley & Sons, Inc., New York, 2003).
M. LAZZARI, and M. LOPEZ-QUINTELA, Adv. Mater. 15 (2003) 1584.
X. L. CHEN, and S. A. JENEKHE, Macromolecules 29 (1996) 6189.
S. SUN, Z. FAN, Y. WANG, C. TAFT, J. HALIBURTON, and S. MAAREF, Spie Proc. 4465 (2002) 121.
Z. FAN, “Synthesis and Characterization of A Novel Block Copolymer System Containing RO-PPV And SF-PPV-I Conjugated Blocks,” MS Thesis, Norfolk State University, Norfolk, Virginia, July 2002.
S. SUN, Z. FAN, Y. WANG, J. HALIBURTON, C. TAFT, K. SEO, and C. BONNER, Syn. Met. 137 (2003) 883.
S. SUN, Z. FAN, Y. WANG, C. TAFT, J. HALIBURTON and S. MAAREF, in “Organic Photovoltaics III,” Spie 4801 (2003) 114.
S. SUN, in “Organic Photovoltaics IV,” SPIE, 5215 (2004) 195.
S. SUN, and C. BONNER, “Chapter 8: Optimizations of Organic Solar Cells in Both Space and Energy/Time Domains” in Organic Photovoltaics: Mechanisms, Materials and Devices, edited by Sun and Sariciftci (CRC Press, Boca Raton, FL, 2005), pp. 183–214.
S. SUN, Z. FAN, Y. WANG, J. HALIBURTON, S. VICK, M. WANG, S. MAAREF, K. WINSTON, A. LEDBETTER, and C. E. BONNER, “Development of a–-Donor-Bridge-Acceptor-Bridge Type Block Copolymer for Potential Photovoltaic Applications,” manuscript in preparation.
S. SUN, Z. FAN, Y. WANG, K. WINSTON, and C. E. BONNER, Mater. Sci. Eng. B. 116 (2004) 279.
D. GOSZTOLA, B. WANG, and M. R. WASIELEWSKI, J. Photochem. Photobiol. (A) 102 (1996) 71.
D. ADAM, P. SCHUHMACHER, J. SIMMERER, L. HAUSSLING, K. SIEMENSMEYER, K. ETZBACH, H. RINGSDORF, and D. HAARER, Nature 371 (1994) 141.
Z. BAO, A. DODABALAPUR, and A. J. LOVINGER, Appl. Phys. Lett. 69 (1996) 4108.
T. NGUYEN, J. WU, V. DOAN, B. SCHWARTZ, and S. H. TOLBERT, Science 288 (2000) 652.
Private communication from Professor Marc Hillmyer.
S. SENSFUSS, et al., “Characterization of Potential Donor Acceptor Pairs for Polymer Solar Cells by ESR, Optical and Electrochemical Investigations,” in Organic Photovoltaics IV, edited by Z. Kafafi and P. Lane, SPIE-proc., (2004) Vol. 5215, p. 129.
V. BALZANI (ed)., “Electron Transfer in Chemistry” (Wiley-VCH, New York, 2000).
R. MARCUS, et al., J. Phys. Chem., B 107 (2003) 6668.
E. PEETERS, P. HAL, J. KNOL, C. BRABEC, N. SARICIFTCI, J. HUMMELEN, and R. JANSSEN, J. Phys. Chem., B B 104 (2000) 10174.
J. BREDAS, et al., J. Am. Chem. Soc. 125 (2003) 8625.
S. SUN, “Organic Solar Cell Optimizations,” project briefings to AFOSR, and NASA, Spring, 2004.
S. SUN, “Sol. Energy Mater. Sol. Cells,” 85 (2005) 261, published online on June 20, 2004.
S. SUN, Mater. Sci. Eng., B, 116 (2004) 251.
A. WELLER, Z. Phys. Chem. 133 (1982) 93.
J. MILLER, L. CALCATERRA, and G. CLOSS, J. Am. Chem. Soc. 106 (1984) 3047.
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Sun, S., Fan, Z., Wang, Y. et al. Organic solar cell optimizations. J Mater Sci 40, 1429–1443 (2005). https://doi.org/10.1007/s10853-005-0579-x
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DOI: https://doi.org/10.1007/s10853-005-0579-x