| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Effect of Crystallinity of Fullerene Derivatives on Doping Density in the Organic Bulk Heterojunction Layer in Polymer Solar Cells |
| LIU Qian, HE Zhi-Qun**, LIANG Chun-Jun, ZHAO Yong, XIAO Wei-Kang, LI Dan |
Key Laboratory of Luminescence and Optical Information (Ministry of Education), Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044
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| Cite this article: |
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LIU Qian, HE Zhi-Qun, LIANG Chun-Jun et al 2015 Chin. Phys. Lett. 32 056801 |
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Abstract Polymer solar cells (PSCs) based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are fabricated by using 1,8-diiodooctane (DIO) as a solvent additive to control the doping density of the PSCs. It is shown that the processing of DIO does not change the doping density of the P3HT phase, while it causes a dramatic reduction of the doping density of the PCBM phase, which decreases the doping density of the whole blend layer from 3.7×1016 cm?3 to 1.2×1016 cm?3. The reduction of the doping density in the PCBM phase originates from the increasing crystallinity of PCBM with DIO addition, and it leads to a decreasing doping density in the blend film and improves the short circuit current of the PSCs.
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Received: 24 December 2014
Published: 01 June 2015
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| PACS: |
88.40.jr
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(Organic photovoltaics)
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73.50.Pz
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(Photoconduction and photovoltaic effects)
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71.55.-i
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(Impurity and defect levels)
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