Dual Interfacial Modification Engineering for Highly Efficient and Stable Perovskite Solar Cells
Dual Interfacial Modification Engineering for Highly Efficient and Stable Perovskite Solar Cells
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高效稳定钙钛矿太阳能电池的双界面改性工程
DOI：
10.1002/solr.202000652
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发表时间：
2020-12
期刊：
影响因子：
7.9
通讯作者：
Hongwei Song
中科院分区：
文献类型：
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作者：
Le Liu;Dali Liu;Rui Sun;Donglei Zhou;Yanjie Wu;Xinmeng Zhuang;Shuainan Liu;Wenbo Bi;Nan Wang;Lu Zi;Boxue Zhang;Zhichong Shi;Hongwei Song
虽然钙钛矿太阳能电池（PSCs）的研究取得了快速的进展，但其效率和稳定性仍需进一步提高，以满足工业要求。位于电池内部、表面、界面或晶界上的缺陷将主要通过形成非辐射复合中心来影响载流子输运，并阻碍功率转换效率（PCE）的进一步提高。在此，开发了一种直接和简单的缺陷钝化方法，以增加PSC的PCE和稳定性。在该器件中，N型半导体AgBiS2作为改性层通过热蒸发引入钙钛矿薄膜和电子传输层之间，可以改善PSC的电荷传输特性和带隙优化。同时，采用二甲基亚砜（DMSO）溶剂混合聚乙二醇（PEG）进行溶剂退火处理，通过增加晶粒尺寸和提高结晶度，进一步改善钙钛矿薄膜的质量，降低陷阱密度。因此，具有双界面改性的PSC表现出PCE从18.58%到21.19%的显著改善，具有出色的长期和水分稳定性。该工作为制备稳定高效的PSC实现产业化提供了新的思路。
Although the research on perovskite solar cells (PSCs) has achieved rapid progress, its efficiency and stability still need to be further improved to meet the industrial requirements. The defects located inside the cells, on the surfaces, interfaces, or grain boundaries, will primarily affect carrier transportation through the formation of nonradiative recombination centers and hinder the further enhancement of the power conversion efficiency (PCE). Herein, a straightforward and simple defect passivation method is developed to increase the PCE and stability of PSCs. In the device, the N‐type semiconductor AgBiS2is introduced by thermal evaporation as a modified layer between the perovskite films and electron transport layer, which can improve the charge transport characteristic and bandgap optimization of PSCs. Simultaneously, dimethyl sulfoxide (DMSO) solvent mixed polyethylene glycol (PEG) is used for solvent annealing treatment, which can further improve the quality of perovskite film and reduce the trap density by increasing grain size and enhancing the crystallinity. As a result, the PSCs with dual‐interfacial modification exhibit a remarkable improvement in PCE from 18.58% to 21.19% with exceptional long‐term and moisture stability. This work provides an innovative insight for fabricating the stable and efficient PSCs toward the industrialization.