Black phosphorus quantum dots as dual-functional electron-selective materials for efficient plastic perovskite solar cells
Black phosphorus quantum dots as dual-functional electron-selective materials for efficient plastic perovskite solar cells
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DOI：
10.1039/c8ta01408f
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发表时间：
2018-05-21
影响因子：
11.9
通讯作者：
Ke, Shanming
中科院分区：
文献类型：
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作者：
Fu, Nianqing;Huang, Chun;Ke, Shanming
有机 - 无机杂化金属卤化物钙钛矿太阳能电池（PSCs）因其高功率转换效率和简单的制备工艺而吸引了大量的研究关注。然而，开发新型电子选择性材料，使其能够同时优化低温制备的柔性有机 - 无机卤化物钙钛矿太阳能电池（PSCs）中金属卤化物钙钛矿薄膜的质量，这一点至关重要，但仍然是一个巨大的挑战。在此，具有双极性导电性、易于溶液加工的黑磷量子点（BPQDs）被开发用作柔性PSCs中的双功能电子选择性层（ESL）。BPQD ESL在形成用于快速电子提取的级联能级以及引导钙钛矿的结晶行为方面发挥着关键作用，从而获得陷阱较少、结晶良好且取向有序的致密钙钛矿薄膜。沉积在BPQD ESL上的钙钛矿薄膜展现出优异的光电性能，由此制备的柔性平面钙钛矿太阳能电池具有11.26% 的较高效率。与未使用ESL、直接构建在裸ITO表面的器件相比，该电池效率提高了3.15倍，这得益于高效的电子提取以及辐射复合和陷阱辅助非辐射复合的抑制。这项工作为开发用于高效太阳能电池的新型电子选择性非氧化物材料开辟了一条有前景的道路。
Organic-inorganic hybrid metal halide perovskite solar cells (PSCs) have attracted tremendous research interest due to their high power conversion efficiency and simple fabrication. However, the exploitation of new electron-selective materials which can simultaneously tailor the quality of metal halide perovskite film for low-temperature-produced plastic organic-inorganic halide perovskite solar cells (PSCs) is of key importance but remains a great challenge. Herein, facile solution-processed black phosphorus quantum dots (BPQDs) with ambipolar conductivity are developed as dual-functional electron-selective layer (ESL) in plastic PSCs. The BPQD ESL plays crucial roles in both forming a cascade energy level for fast electron extraction and guiding the crystallization behavior of the perovskite to yield compact perovskite films with less traps, good crystallization and ordered orientation. The perovskite films deposited on the BPQD ESL exhibit excellent optoelectronic properties, and the resulting plastic planar perovskite solar cells possess a reasonably high efficiency of 11.26%. The 3.15-fold enhancement in efficiency arises from both the efficient electron extraction and suppressed radiative and trapassisted non-radiative recombination compared with the devices built on the bare ITO surface without an ESL. This work paves a promising way for developing novel electron-selective non-oxide materials for highly efficient solar cells.