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基于硫化铅纳米晶植入的钙钛矿薄膜结晶动力学与光伏性能研究
Study on Crystallization Kinetics and Photovoltaic Performance of Perovskite Films with Embedding of PbS Nanocrystals in Grains
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- DOI:
- 作者:
- 刘 晨，翟计洲，郭鹏飞，王洪强
LIU Chen1 , ZHAI Jizhou2 , GUO Pengfei1,3, WANG Hongqiang1,3
- 作者单位:
- 1. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072；2. 西安地球环境创新研究院，陕西 西安 710061；3. 西 北工业大学重庆科创中心，重庆 401135
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China; 3. Innovation Center NPU Chongqing, Chongqing 401135, China
- 关键词:
- 晶内异质界面；结晶动力学；环境稳定性；光电转换效率；杂化钙钛矿薄膜；硫化铅纳米晶
heterointerfaces in grains; crystallization kinetics; environmental stability; power conversion efficiency; hybrid perovskite films; PbS nanocrystals
- 摘要:
- 有机无机杂化钙钛矿太阳能电池的光电转换效率已经得到飞速发展，然而钙钛矿离子的本征不稳定性会
诱导其在快速结晶时形成低质量的薄膜，使得钙钛矿器件在环境稳定性方面仍面临巨大挑战。 本文基于激光制备的无
配体硫化铅纳米晶在钙钛矿晶内的可控植入，创新性地提出构筑晶内异质界面改善钙钛矿薄膜结晶动力学和稳定性的
调控策略。 结果表明，晶内植入硫化铅纳米晶能够抑制钙钛矿中间相生成，并加快形核速率，减缓钙钛矿长大速率，显著
提升了钙钛矿薄膜结晶质量和环境稳定性。 基于硫化铅纳米晶晶内植入的钙钛矿太阳能电池最高光电转换效率达到
22.12%，且在未封装、40%相对湿度条件下经过 5 000 h 仍能保持其初始效率的 95%以上，在惰性气氛、85 ℃下的热稳
定性超过 1 000 h。
Organic and inorganic hybrid perovskite solar cells have achieved rapid development in power conversion efficiency but remain formidable challenges in environmental stability, owing to the intrinsic instability of perovskite ions that can induce low crystal quality during rapid crystallization. The present work innovatively proposed a regulation strategy for constructing heterointerfaces in grains to improve the crystallization kinetics and environmental stability of perovskite films. Such a heterointerface was constructed by controllable embedding of laser-prepared ligand-free PbS nanocrystals in perovskite grains. As a result, the embedding of PbS nanocrystals can inhibit the formation of the intermediate phase, accelerate the nucleation rate and slow the growth rate of perovskite crystals, consequently contributing to the improved crystal quality and environmental stability of perovskite films. Benefiting from these merits, perovskite solar cells based on the embedding of PbS nanocrystals have achieved a power conversion efficiency up to 22.12% . Moreover, the unencapsulated devices maintain over 95% of their initial values after 5 000 h under a relative humidity of 40% and deliver a thermal stability of 1 000 h even under thermal stress of 85 ℃.