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Title of Journal: Chin Sci Bull

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Abbravation: Chinese Science Bulletin

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Springer Berlin Heidelberg

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DOI

10.1002/adfm.201102263

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1861-9541

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Nanoscale structural and electronic evolution for

Authors: Denghua Li Han Yan Chao Li Yanlian Yang Zhixiang Wei Chen Wang
Publish Date: 2014/01/14
Volume: 59, Issue: 4, Pages: 360-368
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Abstract

Control of blend morphology at multiscale is critical for optimizing the power conversion efficiency PCE of plastic solar cells To better understand the physics of photoactive layer in the organic photovoltaic devices it is necessary to gain understanding of morphology and the corresponding electronic property Herein we report the correlation between nanoscale structural electric properties of bulk heterojunction BHJ solar cells and the annealinginduced PCE change We demonstrate that the PCE of BHJ solar cells are dramatically improved from 13  to 46  by thermal annealing which results from P3HT crystalline stacking and the PCBM aggregation for interpenetrated network The similar trend for annealinginduced photovoltage and PCE evolution present as an initial increase followed by a decrease with the annealing time and temperature The surface roughness increase slowly and then abruptly after the same inflection points observed for photovoltage and PCE The phase images in electric force microscopy indicate the optimized P3HT and PCBM crystallization for interpenetrating network formation considering the spectroscopic results as well From the correlation between surface photovoltage blend morphology and PCE we propose a model to illustrate the film structure and its evolution under different annealing conditions This work would benefit the better design and optimization of the morphology and local electric properties of solar cell active layers for improved PCEThis work was supported by the National Basic Research Program of China 2011CB932800 and 2013CB934200 SinoBritish Collaboration Program 2010DFA64680 National Natural Science Foundation of China 20973043 and Chinese Academy of Sciences KGCX2YW3753

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