Enhancing the Photovoltaic Performance via Vertical Phase Distribution Optimization in Small Molecule:PC71BM Blends,Advanced Energy Materials

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Enhancing the Photovoltaic Performance via Vertical Phase Distribution Optimization in Small Molecule:PC71BM Blends
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-01 , DOI: 10.1002/aenm.201701548
Yajie Zhang ₁ , Dan Deng ₁ , Zaiyu Wang ₂ , Yuheng Wang ₃ , Jianqi Zhang ₁ , Jin Fang ₁ , Yang Yang ₁ , Guanghao Lu ₃ , Wei Ma ₂ , Zhixiang Wei _{1,

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Affiliation

Bulk heterojunction (BHJ) morphologies are vital to the device performance of organic solar cells (OSCs), including phase separation in lateral and vertical directions. However, the morphology developed from the blend solution is not easily predicted and controlled, especially in the vertical direction, because the BHJ morphology is kinetically frozen during the rapid solvent evaporation process. Here, a simple approach to control BHJ morphologies with optimized phase distribution for small molecule:[6,6]‐phenyl‐C71‐butyric acid methyl ester (PC₇₁ BM) blends by enhancing the substrate temperature during the spin‐coating process. Three molecules with various fluorine atoms in the end acceptor units are selected. The relationship among molecular structures, substrate temperature effects on the morphology, and device performances are symmetrically investigated. Low temperature induces a multiple‐sublayer‐like architecture with significantly varied distributions of composition, morphology, and localized state energy, while high processing temperature induces more uniform film. The short‐circuit current, open‐circuit voltage, and fill factor of the devices are tuned with synergic improvement of efficiency toward over 10% and 11% for conventional and inverted devices. This work reveals the origination of vertical phase segregation, and provides a facile strategy to optimize the hierarchical phase separation for enhancing the performance of OSCs.

中文翻译：

通过垂直相分布优化优化小分子：PC71BM共混物中的光伏性能

体异质结（BHJ）形态对于有机太阳能电池（OSC）的器件性能至关重要，包括横向和垂直方向的相分离。但是，由于在快速溶剂蒸发过程中BHJ形态在动力学上被冻结，因此不容易预测和控制从混合溶液中形成的形态，尤其是在垂直方向上。在这里，有一种简单的方法可以控制BHJ形态，并为小分子优化相分布：[6,6]-苯基-C71-丁酸甲酯（PC ₇₁BM）通过在旋涂过程中提高基材温度来进行混合。选择在末端受体单元中具有各种氟原子的三个分子。对称地研究了分子结构，衬底温度对形貌的影响以及器件性能之间的关系。低温诱导了类似多层结构的结构，其组成，形态和局部态能的分布均发生了显着变化，而高温则诱导了更均匀的薄膜。器件的短路电流，开路电压和填充系数可通过将传统器件和反相器件的效率协同提高至10％和11％以上来进行调整。这项工作揭示了垂直相分离的起源，

更新日期：2017-09-01

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