Entropy of Charge Separation in Organic Photovoltaic Cells: The Benefit of Higher Dimensionality

被引:219
作者
Gregg, Brian A. [1 ]
机构
[1] Natl Renewable Energy Lab, Golden, CO 80401 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2011年 / 2卷 / 24期
关键词
SOLAR-CELLS;
D O I
10.1021/jz2012403
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The role of entropy in charge separation processes is discussed with respect to the dimensionality of the organic semiconductor. In 1-D materials, the change in entropy, Delta S, plays no role, but at higher dimensions, it leads to a substantial decrease in the Coulomb barrier for charge separation. The effects of Delta S are highest in equilibrium systems but decrease and become time-dependent in illuminated organic photovoltaic (OPV) cells. Higher-dimensional semiconductors have inherent advantages for charge separation, and this may be one reason that C(60) and its derivatives, the only truly three-dimensional organic semiconductors yet known, play such an important role in OPV cells.
引用
收藏
页码:3013 / 3015
页数:3
相关论文
共 8 条
[1]   Polymer-Fullerene Bulk-Heterojunction Solar Cells [J].
Brabec, Christoph J. ;
Gowrisanker, Srinivas ;
Halls, Jonathan J. M. ;
Laird, Darin ;
Jia, Shijun ;
Williams, Shawn P. .
ADVANCED MATERIALS, 2010, 22 (34) :3839-3856
[2]   Polymer solar cells with enhanced open-circuit voltage and efficiency [J].
Chen, Hsiang-Yu ;
Hou, Jianhui ;
Zhang, Shaoqing ;
Liang, Yongye ;
Yang, Guanwen ;
Yang, Yang ;
Yu, Luping ;
Wu, Yue ;
Li, Gang .
NATURE PHOTONICS, 2009, 3 (11) :649-653
[3]   Charge Photogeneration in Organic Solar Cells [J].
Clarke, Tracey M. ;
Durrant, James R. .
CHEMICAL REVIEWS, 2010, 110 (11) :6736-6767
[4]   Coulomb forces and doping in organic semiconductors [J].
Gregg, BA ;
Chen, SG ;
Cormier, RA .
CHEMISTRY OF MATERIALS, 2004, 16 (23) :4586-4599
[5]   2,3,7,8,12,13,17,18-OCTAKIS (BETA-HYDROXYETHYL)PORPHYRIN (OCTAETHANOLPORPHYRIN) AND ITS LIQUID-CRYSTALLINE DERIVATIVES - SYNTHESIS AND CHARACTERIZATION [J].
GREGG, BA ;
FOX, MA ;
BARD, AJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1989, 111 (08) :3024-3029
[6]   Molecular Semiconductors in Organic Photovoltaic Cells [J].
Hains, Alexander W. ;
Liang, Ziqi ;
Woodhouse, Michael A. ;
Gregg, Brian A. .
CHEMICAL REVIEWS, 2010, 110 (11) :6689-6735
[7]   Organic photovoltaics [J].
Kippelen, Bernard ;
Bredas, Jean-Luc .
ENERGY & ENVIRONMENTAL SCIENCE, 2009, 2 (03) :251-261
[8]   HIGH-DENSITY NANOSECOND CHARGE TRAPPING IN THIN-FILMS OF THE PHOTOCONDUCTOR ZNODEP [J].
LIU, CY ;
PAN, HI ;
FOX, MA ;
BARD, AJ .
SCIENCE, 1993, 261 (5123) :897-899