期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 157, 期 -, 页码 266-275出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2016.05.050
关键词
Thin-film photovoltaics; Radio frequency sputter deposition; Transparent conducting oxides; UV photoelectron spectroscopy; II-VI semiconductors
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- PPG Industries
- Department of Energy Supply Chain Program [DE-EE000 4736]
- National Science Foundation Accelerating Innovation Research (AIR) Program [IIP-1127362]
- Department of Energy F-PACE Program [DE-EE000 5399]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1538733] Funding Source: National Science Foundation
Resistive oxide materials play an important role in the front contact of CdTe solar cells. The high-resistance transparent (HRT) or buffer layer has been used extensively in CdTe thin-film photovoltaics to enable a reduction in CdS thickness while maintaining near-maximum device voltage and fill factor. SnO2- and ZnO-based alloys were tested as HRT layers on a fluorine-doped tin oxide transparent conducting oxide. SnO2-based alloy HRT layers were deposited via atmospheric pressure chemical vapor deposition (APCVD). Alloying ZnO with MgO to create Mg5Zn1-xO) (MZO) via radio-frequency sputter deposition Was explored as a way to reduce the electron affinity of ZnO HRT layers. To fully understand the behavior of these materials, many devices were fabricated with either no CdS layer, a sublimated CdS layer, or a sputtered, oxygenated CdS layer. MZO layers resulted in high open-circuit voltage and device efficiency even with the complete elimination of the CdS layer. In both HRT systems, controlling electron affinity to optimize front contact band alignment is an important consideration. Band measurements using photoelectron spectroscopy and synchrotron techniques correlate band alignment measurements with efficiency parameters in the design of HRT and CdS layers. (C) 2016 Elsevier B.V. All rights reserved.
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