State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
Nanoscale. 2019 Feb 28;11(9):4035-4043. doi: 10.1039/c8nr09467e.
Suitable vertical component distribution within an organic bulk-heterojunction (BHJ) is vital for effective exciton dissociation and smooth charge transport in perovskite/organic integrated solar cells (ISCs). Herein, a bi-continuous interpenetrating network of organic donor/acceptor materials is constructed simply by optimizing their weight ratio, and is further applied in perovskite/organic ISCs. Time-of-flight secondary-ion mass spectroscopy (TOF-SIMS) and scanning Kelvin probe microscopy (SKPM) strongly confirm that this method can effectively restrict vertical stratification and build a desired bi-continuous framework within the organic photoactive layer, which can effectively suppress two potential recombination losses from the viewpoint of kinetics, leading to the PCE increasing from 12.63% to 15.47% for ISCs based on the structure of MAPbI3/PBDB-T : IEICO. Meanwhile, our ISCs combining a UV-vis harvesting layer of MAPbI3 and a near-infrared absorbing layer of PBDB-T : IEICO exhibit a photo-response extending to the whole visible and infrared spectrum (up to 900 nm). This work verifies that tuning the donor/acceptor weight ratio is a feasible strategy for optimizing the morphology of BHJ absorbers and suppressing charge recombination for efficient perovskite/BHJ ISCs.
在有机体异质结（BHJ）中，合适的垂直组分分布对于钙钛矿/有机集成太阳能电池（ISCs）中有效的激子解离和顺畅的电荷输运至关重要。在此，通过优化其重量比，简单地构建了有机给体/受体材料的双连续互穿网络，并进一步应用于钙钛矿/有机 ISCs。飞行时间二次离子质谱（TOF-SIMS）和扫描开尔文探针显微镜（SKPM）强烈证实，该方法可以有效地限制垂直分层，并在有机光活性层内构建理想的双连续框架，这可以从动力学的角度有效抑制两种潜在的复合损耗，从而使基于 MAPbI3/PBDB-T：IEICO 结构的 ISCs 的 PCE 从 12.63%提高到 15.47%。同时，我们的 ISCs 结合了 MAPbI3 的紫外可见吸收层和 PBDB-T：IEICO 的近红外吸收层，表现出扩展到整个可见和红外光谱（高达 900nm）的光响应。这项工作验证了调整给体/受体重量比是优化 BHJ 吸收体形态和抑制电荷复合以实现高效钙钛矿/BHJ ISCs 的可行策略。
