材料科学
钝化
量子点
光电子学
硫化铅
载流子
光伏
载流子寿命
能量转换效率
硫系化合物
纳米技术
图层(电子)
光伏系统
生态学
生物
硅
作者
Chao Ding,Dandan Wang,Dong Liu,Hua Li,Yusheng Li,Shuzi Hayase,Tomah Sogabe,Taizo Masuda,Yong Zhou,Yingfang Yao,Zhigang Zou,Ruixiang Wang,Qing Shen
标识
DOI:10.1002/aenm.202201676
摘要
Abstract Lead sulfide colloidal quantum dot solar cells (CQDSCs), the next generation of photovoltaics, are hampered by non‐radiative recombination induced by defects and an electron‐hole extraction imbalance. CQDSCs have three interfaces: CQD/CQD, electron transport layer (ETL)/CQD, and CQD/hole transport layer (HTL), and modifying one of these interfaces does not fix the problem stated above. Here, coordinated control and passivation of the three interfaces in PbS CQDSCs are presented and it is shown that the synergistic effects may improve charge transport and charge carrier extraction balance and minimize non‐radiative recombination simultaneously. A facile method is developed for epitaxially growing an ultrathin perovskite shell on the CQD surface to passivate the CQD/CQD interface, resulting in CQD absorber layers with long carrier diffusion lengths. With the introduction of organic films with adjustable electrical characteristics, the influence of ETL/CQD interfacial modifications on carrier transport and recombination is investigated. An excessive increase in the electron extraction rate reduces the fill factor and solar efficiency, as discovered. Therefore a modified layer is created at the CQD/HTL interface to promote hole extraction, which enhances charge extraction balance and passivates the interface. Finally, PbS CQDSCs exhibit a power conversion efficiency of 15.45%, a record for Pb chalcogenide CQDSCs.
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