標題: | Efficient bilayer polymer solar cells possessing planar mixed-heterojunction structures |
作者: | Huang, Jen-Hsien Li, Kuang-Chieh Kekuda, Dhananjay Padhy, Hari Hara 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: | 2010 |
摘要: | We have investigated the influence of thermal annealing on the performance of polymer bilayer solar cell devices incorporating poly{2,6-(4,4-bis[2-ethylhexyl]-4H-cyclopenta[2,1-b;3,4-b'] dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)} (PCPDTTBT) as the donor and two kinds of fullerenes (C(60), C(70)) as acceptors. The higher absorption of C(70) increased the external quantum efficiency in the spectral range 400-600 nm. We observed morphological changes of the polymer films when the pre-annealing temperature was near the crystalline temperature (T(c), 207 degrees C). These nanostructural transformations resulted in a modified interfacial morphology of the donor phases and, therefore, greatly influenced the device performance. Post-annealing treatment reorganized the interface between the donor and acceptor phases, leading to better contact. The highest power conversion efficiency (2.85%) was obtained when we performed device pre- and post-annealing both at 200 degrees C for 30 min; the open-circuit voltage was 0.69 V and the short-circuit current was 8.42 mA cm(-2). |
URI: | http://hdl.handle.net/11536/20178 http://dx.doi.org/10.1039/b924147g |
ISSN: | 0959-9428 |
DOI: | 10.1039/b924147g |
期刊: | JOURNAL OF MATERIALS CHEMISTRY |
Volume: | 20 |
Issue: | 16 |
起始頁: | 3295 |
結束頁: | 3300 |
顯示於類別: | 會議論文 |