期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 17, 页码 19469-19479出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02023
关键词
perovskite solar cells; all-inorganic perovskites; compositional engineering; interface passivation; power conversion efficiency; stability
资金
- National Science Foundation [ECCS/EPMD1903303]
Perovskite solar cells (PSCs) are cost-effective solar technology. This study developed a novel all-inorganic perovskite that improved the performance and stability of the cells through heterovalent substitution. Additionally, surface passivation technique further enhanced the device performance. This approach provides a facile way to achieve high-performance PSCs.
Perovskite solar cells (PSCs) have emerged as a cost-effective solar technology in the past years. PSCs by three-dimensional hybrid inorganic-organic perovskites exhibited decent power conversion efficiencies (PCEs); however, their stabilities were poor. On the other hand, PSCs by all-inorganic perovskites indeed exhibited good stability, but their PCEs were low. Here, the development of novel allinorganic perovskites CsPbI2Br:xNd(3+), where Pb2+ at the B-site is partially heterovalently substituted by Ne, is reported. The CsPbI2Br:xNd(3+) thin films possess enlarged crystal sizes, enhanced charge carrier mobilities, and superior crystallinity. Thus, the PSCs by the CsPbI2Br:xNd(3+) thin films exhibit more than 20% enhanced PCEs and dramatically boosted stability compared to those based on pristine CsPbI2Br thin films. To further boost the device performance of PSCs, solution-processed 4-lithium styrenesulfonic acid/styrene copolymer (LiSPS) is utilized to passivate the surface defect and suppress surface charge carrier recombination. The PSCs based on the CsPbI2Br:xNd(3+)/LiSPS bilayer thin film possess reduced charge extraction lifetime and suppressed charge carrier recombination, resulting in 14% enhanced PCEs and significantly boosted stability compared to those without incorporation of the LiSPS interface passivation layer. All these results indicate that we developed a facile way to approach high-performance PSCs by all-inorganic perovskites.
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