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Rational Surface-Defect Control via Designed Passivation for High-Efficiency Inorganic Perovskite Solar Cells
Xiaojing Gu1, Wanchun Xiang1, Qingwen Tian1
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Histamine (HA) effectively passivates iodine vacancies and undercoordinated lead in perovskite films, reducing charge recombination. This passivation enhances inorganic perovskite solar cell efficiency to a record 20.8%.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Nonradiative charge recombination in all-inorganic perovskite films is primarily caused by iodine vacancies (VI) and undercoordinated Pb2+.
- These defects significantly limit the performance of perovskite solar cells (PSCs).
Purpose of the Study:
- To investigate the passivation effect of histamine (HA) on defects in perovskite films.
- To improve the efficiency of inorganic metal halide perovskite solar cells.
Main Methods:
- Theoretical study of histamine's interaction with perovskite surface defects.
- Experimental passivation of perovskite films using histamine.
- Fabrication and characterization of perovskite solar cells.
Main Results:
- Histamine passivates iodine vacancies via Lewis base-acid interaction, strengthened by hydrogen bonds.
- Passivation of undercoordinated Pb2+ and Pb clusters reduces trap density and prolongs charge lifetime.
- Histamine treatment shifts the perovskite energy band edge, improving hole transfer and increasing solar cell efficiency from 19.5% to 20.8%.
Conclusions:
- Histamine is an effective, environmentally benign passivating agent for perovskite films.
- Histamine passivation significantly enhances the performance of inorganic metal halide PSCs, achieving a record efficiency.
- This approach offers a promising strategy for developing highly efficient and stable perovskite solar cells.
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