標題: Correlation between Exciton Lifetime Distribution and Morphology of Bulk Heterojunction Films after Solvent Annealing
作者: Huang, Jen-Hsien
Li, Kuang-Chieh
Chien, Fan-Ching
Hsiao, Yu-Sheng
Kekuda, Dhananjay
Chen, Peilin
Lin, Hong-Cheu
Ho, Kuo-Chuan
Chu, Chih-Wei
材料科學與工程學系
光電工程學系
Department of Materials Science and Engineering
Department of Photonics
公開日期: 20-May-2010
摘要: We have synthesized a low-bandgap polymer, bithiazole-based polymer (PCPDTTBT) containing cyclopentadithiophene and thiophene units, and studied its opticophysical properties and morphologies in bulk heterojunction films after annealing. We used confocal optical microscopy in conjunction with a fluorescence module to record exciton lifetime images within photoactive layers of PCPDTTBT and [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM). These images, which were consistent with those recorded using atomic force microscopy and transmission electron microscopy, revealed that phase separation of PCPDTTBT and PCBM occurred during slow solvent evaporation. This phase separation not only provided bicontinuous pathways for carrier transport to the respective electrodes hut also enhanced the degree of polymer chain stacking, thereby improving the absorption and balancing the electron and hole mobilities. We tested the performance of solar cells incorporating PCPDTTBT and various fullerene derivatives. Under AM 1.5 G illumination (100 mW cm(-2)), a PCPDTTBT/bisPCBM-based solar cell exhibited a power conversion efficiency of 3.8%, with a short circuit current of 7.3 mA cm(-2), an open circuit voltage of 0.88 V, and a fill factor of 59.1%.
URI: http://dx.doi.org/10.1021/jp9120639
http://hdl.handle.net/11536/5396
ISSN: 1932-7447
DOI: 10.1021/jp9120639
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 114
Issue: 19
起始頁: 9062
結束頁: 9069
Appears in Collections:Articles


Files in This Item:

  1. 000277500000051.pdf