材料科学
有机太阳能电池
聚合物
活动层
喷墨打印
聚合物太阳能电池
接受者
有机电子学
下降(电信)
纳米技术
纳米尺度
化学工程
图层(电子)
墨水池
复合材料
晶体管
工程类
电压
凝聚态物理
物理
薄膜晶体管
电信
量子力学
计算机科学
作者
Xingze Chen,Rong Huang,Yunfei Han,Wusong Zha,Jin Fang,Jian Lin,Qun Luo,Zheng Chen,Chang‐Qi Ma
标识
DOI:10.1002/aenm.202200044
摘要
Abstract Drop‐on demand inkjet‐printing (IJP) is a deposition technique with promise in the context of fabricating large‐area organic solar cells (OSCs) because of its high material usage, direct‐pattern, and large‐area roll‐to‐roll printing compatibility. But its feature of drop‐to‐drop deposition during IJP makes the film's drying and phase separation process different from spin‐coating, and forms different nanophase separation and vertical phase separation morphology. In this work, the nanophase separation of the inkjet‐printed organic blend films is systematically studied at different substrate temperatures. The results reveal that increasing the substrate temperature can suppress excess molecules aggregation owing to the high drying speed, leading to improved exciton dissociation efficiency in the blend films. However, the quick drying process at high temperature also leads to a homogenous vertical phase separation, which is not ideal for charge collection. Instead of printing the mixture of donor and acceptor solution directly to form the bulk‐heterojunction structure, the polymer donor is printed on the top of the acceptor surface, a so‐called layer‐by‐layer inkjet printing (LBL‐IJP) process. By using this LBL‐IJP route, balanced nanoscale phase aggregation and gradient vertical phase separation morphology are achieved, which leads to a record power conversion efficiency of 13.09% for the OSCs with an inkjet‐printed active layer.
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