期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 4, 页码 2896-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00233
关键词
cadmium telluride; CdTe; zinc magnesium oxide; ZMO; S-kink
资金
- Air Force Research Laboratory, Space Vehicles Directorate [FA9453-11-C-0253]
- National Science Foundation [1711534]
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) [DE-EE0007541]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1711534] Funding Source: National Science Foundation
Comparing to the traditional CdS buffer layer, zinc magnesium oxide (ZMO) offers the following advantages for CdTe-based thin-film solar cells: it introduces a spike to conduction band offset, which reduces interface recombination that is beneficial for increasing open-circuit voltage (V-OC) and decreases parasitic optical absorption of the buffer layer that is favorable for enhancing short-circuit current (J(SC)). However, ZMO/CdTe thin-film solar cells often show the so-called S-kink behavior in their current-voltage curves, making it difficult to reproduce the expected benefits. Here, we show that S-kink can be successfully eliminated, and improved V-OC and J(SC) can be simultaneously achieved if the CdCl2 treatment process is conducted in oxygen-free atmosphere. As a result, the device efficiencies increased from 9.2% to 16.1%. Our device characterizations and simulations reveal that a sufficiently high electron density of the ZMO buffer layer is critical to eliminate the S-kink, which is achievable through an oxygen-free CdCl2 treatment.
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