Journal
ACS PHOTONICS
Volume 5, Issue 6, Pages 2094-2099Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00427
Keywords
ZnSnN2; thin films; Al2O3 buffer layer; interface energy gap; conduction band offset; band alignment engineering; heterojunction solar cell
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Funding
- National Natural Science Foundation of China [61474126]
- Natural Science Foundation of Zhejiang Province [LY16F040002]
- program for Ningbo Municipal Science and Technology Innovative Research Team [2016B10005]
- CAS-TWAS president's fellowship program
- World Academy of Sciences (TWAS)
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A new ternary-alloy, zinc-tin nitride (ZnSnN2), is considered as one of the most promising absorber materials for photovoltaic applications due to its ideal band gap, rich ternary-chemistry, robust optical absorption, and low cost. In the present work, we demonstrate the ZnSnN2-based P-N and P-i-N heterojunctions to study the band offset engineering for the development of high-efficiency inorganic solar cell. The P-i-N heterojunction is composed of p-SnO, i-Al2O3, and n-ZnSnN2 constituents. The inclusion of the i-Al2O3 buffer layer has remarkably improved the solar cell efficiency by regulating the conduction band offset and interface energy gap. It is believed that our present work will offer a promising approach to manufacture ZnSnN2-based heterojunctions with better band alignment for novel photovoltaic applications.
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