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Issue 35, 2014
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Effect of thermal annealing on active layer morphology and performance for small molecule bulk heterojunction organic solar cells

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Abstract

New molecule design and device optimization are two of the main strategies used to obtain high performance organic photovoltaics. In this paper, bulk heterojunction solar cell devices using a newly designed solution-processable small molecule (DRDTSBDTT) were systematically investigated for their JV behavior and the morphology of the active layer under different annealing treatments to understand the impact of thermal annealing on open circuit voltage, short circuit current and fill factor. A strong relationship was found between thermal annealing and these factors. JV behavior analysis indicates that this is because of the efficiency change of the fundamental exciton diffusion, charge separation and collection steps, which is supported by morphology studies for the active layer under different thermal treatments. The results show that for optimized performance of a given molecule, the morphology and phase control are the most important factors to achieve intrinsic best performance. With these, the power conversion efficiency was increased from 3.36% to 5.05% under optimized annealing treatment for DRDTSBDTT-based devices.

Graphical abstract: Effect of thermal annealing on active layer morphology and performance for small molecule bulk heterojunction organic solar cells

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Supplementary files

Article information


Submitted
13 May 2014
Accepted
04 Jul 2014
First published
10 Jul 2014

J. Mater. Chem. C, 2014,2, 7247-7255
Article type
Paper
Author version available

Effect of thermal annealing on active layer morphology and performance for small molecule bulk heterojunction organic solar cells

Z. Yi, W. Ni, Q. Zhang, M. Li, B. Kan, X. Wan and Y. Chen, J. Mater. Chem. C, 2014, 2, 7247
DOI: 10.1039/C4TC00994K

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