Spatial Distribution Recast for Organic Bulk Heterojunctions for High‐Performance All‐Inorganic Perovskite/Organic Integrated Solar Cells,Advanced Energy Materials

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Spatial Distribution Recast for Organic Bulk Heterojunctions for High‐Performance All‐Inorganic Perovskite/Organic Integrated Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-08-02 , DOI: 10.1002/aenm.202000851
Weijie Chen ₁ , Dong Li ₂ , Shanshan Chen ₃ , Shuo Liu ₁ , Yunxiu Shen ₁ , Guang Zeng ₁ , Xiaozhang Zhu ₄ , Erjun Zhou ₅ , Lin Jiang ₂ , Yaowen Li ₁ , Yongfang Li _{1,

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Affiliation

All‐inorganic CsPbIBr₂ perovskite solar cells (pero‐SCs) exhibit excellent overall stability, but their power conversion efficiencies (PCEs) are greatly limited by their wide bandgaps. Integrated solar cells (ISCs) are considered to be an emergent technology that could extend their photoresponse by directly stacking two distinct photoactive layers with complementary bandgaps. However, rising photocurrents always sacrifice other photovoltaic parameters, thereby leading to an unsatisfactory PCE. Here, a recast strategy is proposed to optimize the spatial distribution components of low‐bandgap organic bulk‐heterojunction (BHJ) film, and is combined with an all‐inorganic perovskite to construct perovskite/BHJ ISCs. With this strategy, the integrated perovskite/BHJ film with a top‐enriched donor‐material spatial distribution is shown to effectively improve ambipolar charge transport behavior and suppress charge carrier recombination. For the first time, the ISC is not only significantly extended and enhanced the photoresponse achieving a 20% increase in current density, but also exhibits a high open‐circuit voltage and fill factor at the same time. As a result, a record PCE of 11.08% based on CsPbIBr₂ pero‐SCs is realized; it simultaneously shows excellent long‐term stability against heat and ultraviolet light.

中文翻译：

高性能全无机钙钛矿/有机集成太阳能电池有机本体异质结的空间分布重塑

全无机CsPbIBr ₂钙钛矿太阳能电池（pero-SCs）具有出色的整体稳定性，但其功率转换效率（PCE）受其宽带隙的限制很大。集成太阳能电池（ISC）被认为是一种新兴技术，可以通过直接堆叠两个具有互补带隙的不同光敏层来扩展其光响应。但是，不断上升的光电流总是会牺牲其他光伏参数，从而导致PCE不能令人满意。在此，提出了一种重铸策略，以优化低带隙有机体异质结（BHJ）薄膜的空间分布组件，并与全无机钙钛矿相结合以构造钙钛矿/ BHJ ISC。有了这个策略，钙钛矿/ BHJ集成膜具有最丰富的供体材料空间分布，可有效改善双极性电荷传输行为并抑制电荷载流子复合。第一次，ISC不仅显着扩展并增强了光响应，使电流密度增加了20％，而且同时还表现出高的开路电压和填充因子。结果，基于CsPbIBr，PCE达到了创纪录的11.08％实现了_2个pero-SC；同时显示出出色的长期抗热和紫外线稳定性。

更新日期：2020-09-15

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