15.3%-Efficient GaAsP Solar Cells on GaP/Si Templates
Journal Article
·
· ACS Energy Letters
- Yale Univ., New Haven, CT (United States). Dept. of Electrical Engineering; National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Electrical and Computer Engineering
- Yale Univ., New Haven, CT (United States). Dept. of Electrical Engineering
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- King Juan Carlos Univ., Madrid (Spain). Dept. of Electrical Technology
- Arizona State Univ., Tempe, AZ (United States). School of Electrical, Computer and Energy Engineering
- School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, United States
As single-junction Si solar cells approach their practical efficiency limits, a new pathway is necessary to increase efficiency in order to realize more cost-effective photovoltaics. Integrating III-V cells onto Si in a multijunction architecture is a promising approach that can achieve high efficiency while leveraging the infrastructure already in place for Si and III-V technology. In this Letter, we demonstrate a record 15.3%-efficient 1.7 eV GaAsP top cell on GaP/Si, enabled by recent advances in material quality in conjunction with an improved device design and a high-performance antireflection coating. Furthermore, we present a separate Si bottom cell with a 1.7 eV GaAsP optical filter to absorb most of the visible light with an efficiency of 6.3%, showing the feasibility of monolithic III-V/Si tandems with >20% efficiency. Through spectral efficiency analysis, we also compare our results to previously published GaAsP and Si devices, projecting tandem GaAsP/Si efficiencies of up to 25.6% based on current state-of-the-art individual subcells. With the aid of modeling, we further illustrate a realistic path toward 30% GaAsP/Si tandems for high-efficiency, monolithically integrated photovoltaics.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1394745
- Report Number(s):
- NREL/JA--5J00-70182
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 8 Vol. 2; ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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