Correlation between Exciton Lifetime Distribution and Morphology of Bulk Heterojunction Films after Solvent Annealing

被引：28

作者：

Huang, Jen-Hsien ^{[1
]}

Li, Kuang-Chieh ^{[3
]}

Chien, Fan-Ching ^{[1
]}

Hsiao, Yu-Sheng ^{[1
]}

Kekuda, Dhananjay ^{[1
]}

Chen, Peilin ^{[1
]}

Lin, Hong-Cheu ^{[3
]}

Ho, Kuo-Chuan ^{[2
,4
]}

Chu, Chih-Wei ^{[1
,5
]}

机构：

[1] Acad Sinica, Res Ctr Appl Sci, Taipei 115, Taiwan

[2] Natl Taiwan Univ, Dept Chem Engn, Taipei 10617, Taiwan

[3] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[4] Natl Taiwan Univ, Inst Polymer Sci & Engn, Taipei, Taiwan

[5] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30010, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 19期

关键词：

POLYMER SOLAR-CELLS; BAND-GAP POLYMER; HIGHLY EFFICIENT; POLY(3-HEXYLTHIOPHENE); POLYFLUORENE; TEMPERATURE; PERFORMANCE; DERIVATIVES; TRANSISTORS; COPOLYMERS;

D O I：

10.1021/jp9120639

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：

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%.

引用

页码：9062 / 9069

页数：8

共 49 条

[1] Imaging of the 3D Nanostructure of a Polymer Solar Cell by Electron Tomography [J].