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Strain-Induced Metallization and Defect Suppression at Zipper-like Interdigitated Atomically Thin Interfaces Enabling
Nikolai Tsvetkov1, Muhammad Ejaz Khan2,3, Byeong Cheul Moon1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
ACS Nano
|December 15, 2020
Summary
Researchers developed a novel PbO capping method to create a metallic interface between perovskite light absorbers and electron transport layers (ETLs). This significantly boosts charge extraction and enhances solar cell performance.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Physics
Background:
- Halide perovskites offer efficient solar energy absorption for photovoltaics.
- Charge accumulation and recombination at perovskite/electron transport layer (ETL) interfaces limit device performance.
Purpose of the Study:
- To engineer a high-performance perovskite/ETL interface for enhanced charge extraction.
- To investigate the mechanism behind improved interfacial properties.
Main Methods:
- Experimental realization of a zipper-like interdigitated interface using PbO capping on ETL surfaces.
- First-principles calculations (e.g., on MAPbI3/TiO2) to understand interfacial metallicity.
- Experimental validation of interfacial metallic states and defect passivation.
Main Results:
- PbO capping creates an atomically thin 2D metallic layer at the perovskite/ETL interface.
- Interfacial strain from Pb-I-Pb and Pb-O bonds drives the metallicity.
- Charge extraction rate increased approximately twofold.
- Monolayer PbO capping yielded optimal photovoltaic efficiency.
Conclusions:
- A general interface engineering strategy for perovskite/ETL interfaces is established.
- The zipper-like metallic interface enhances charge extraction and boosts solar cell performance.
- This approach is applicable to various ETL materials (ZnO, SrTiO3).
