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Universal Efficiency Improvement in Organic Solar Cells Based on a Poly(3‐hexylthiophene) Donor and an Indene‐C 60 Bisadduct Acceptor with Additional Donor Nanowires
Author(s) -
Joe Sungyoon,
Yim Jong Hyuk,
Ryu Shin Young,
Ha Na Young,
Ahn Yeong Hwan,
Park JiYong,
Lee Soonil
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402762
Subject(s) - energy conversion efficiency , acceptor , indene , open circuit voltage , organic solar cell , materials science , short circuit , quantum efficiency , optoelectronics , nanotechnology , chemical engineering , photochemistry , chemistry , voltage , organic chemistry , physics , quantum mechanics , composite material , condensed matter physics , polymer , engineering
With poly(3‐hexylthiophene) (P3HT) nanowire (NW) inclusion in active layers (ALs), organic solar cells (OSCs) based on P3HT donor and indene‐C 60 bisadduct (ICBA) acceptor showed power conversion efficiency ( PCE ) improvements for both bulk heterojunction (BHJ)‐ and bilayer (BL)‐structure AL devices. The PCE increase was approximately 14 % for both types of P3HT:ICBA OSCs. However, improvements in short‐circuit current density ( J sc ) were about 4.4 and 6.4 % for BHJ‐ and BL‐type AL devices, respectively. A systematic study showed that the addition of P3HT NWs did not result in enhanced internal quantum efficiencies for either type of device. However, the difference in light‐harvesting efficiency was important in accounting for J sc variations. Interestingly, there was no correlation between J sc and PCE variations, whereas the open‐circuit voltage ( V oc ) and fill factor ( FF ) showed correlations with the PCE . The variation in FF is discussed in terms of V oc and equivalent‐circuit parameters based on a nonideal diode model.