journal article·2020-07-10

Ligand Orientation-Induced Lattice Robustness for Highly Efficient and Stable Tin-Based Perovskite Solar Cells

Peizhou Li, Hua Dong, Jie Xu, Jinbo Chen, Bo Jiao, Xun Hou, Jingrui Li, Zhaoxin Wu

ACS Energy Letters· Volume 5· Issue 7
Publisher page

Abstract

Low-toxicity tin-based perovskites have exhibited huge potential for photovoltaics applications. However, the facile oxidation of Sn2+ to Sn4+ induces ubiquitous Sn vacancies and p-type doping in perovskite films. In addition, the fast crystallization easily leads to poor film morphology and high defect concentration. In this work, we developed a film-formation strategy via the fluoro-aniline isomers medium and achieved the simultaneous restriction of Sn2+ oxidation and regulation of crystallization. The ortho-fluorine ligand, which exhibits unidirectional and bent geometry at the surface, could contribute to the lattice robustness with better restriction of Sn vacancy formation, compared with the bidirectional and vertical ligands. The resulting perovskite solar cell (PSC) device modified by 2-F-PEA shows a considerable PCE of 10.17% (certified 8.58%), with an efficiency attenuation of less than 15% under 1600 h of light aging testing. Our findings could provide a new avenue for the enhancement of both efficiency and stability of tin-based PSCs.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an 710049, China

Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Faculty of Electronic and Information Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an 710049, China

Funding

China Postdoctoral Science Foundation · Education Department of Shaanxi Province · National Natural Science Foundation of China · Natural Science Basic Research Plan in Shaanxi Province of China

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