Solution-processable polymer based photovoltaic devices with concentration graded bilayers made via composition control of a poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acidmethyl ester
Solution-processable polymer based photovoltaic devices with concentration graded bilayers made via composition control of a poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acidmethyl ester
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DOI：
10.1039/b926105b
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发表时间：
2010-06
影响因子：
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通讯作者：
Dong Hwan Wang;D. Choi;O Ok Park;Jong Hyeok Park
中科院分区：
文献类型：
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作者：
Dong Hwan Wang;D. Choi;O Ok Park;Jong Hyeok Park
采用旋涂法制备的体异质结（BHJ）有源层由于其较大的施主-受主界面接触面积而被广泛研究，这将导致光电流密度的增加。众所周知，浓度梯度结构不仅可以增强电荷产生，而且可以增强电荷输运，但是，在BHJ系统中很难表现出这样的结构。其原因是BHJ的形貌来源于热退火步骤中的自组织。本文首次采用溶液法制备了具有浓度梯度双层结构的聚合物基光伏（PV）器件。的浓度分布已被证实的俄歇电子能谱。优化的双层器件具有均匀的形态显示增强的光电流密度和功率转换效率相比，所表现出的BHJ为基础的PV器件。
The bulk-heterojunction (BHJ) active layer, prepared by a spin-coating process, has been extensively investigated for its large donor–acceptor interfacial contact area, which can result in increased photo-current density. It is known that a concentration graded structure would enhance not only the charge generation but also charge transport, but, it is very difficult to exhibit such structure in BHJ system. The reason is that the morphology of the BHJ originates from self organization during the thermal annealing step. In this paper, polymer based photovoltaic (PV) devices with concentration graded bilayers have been successfully fabricated for the first time by solution process with various composition controlled poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acidmethyl ester (PCBM) mixtures. The concentration profiles have been confirmed by Auger electron spectroscopy. The optimized bilayer devices with uniform morphology show enhanced photocurrent density and power conversion efficiency when compared to those exhibited by BHJ based PV devices.