Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 130, Issue -, Pages 354-363Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2014.07.018
Keywords
Device modeling; InGaN; Polarization; Heterojunction; Homojunction
Funding
- National Science Foundation (NSF)
- Department of Energy (DOE) under NSF CA [EEC-1041895]
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Indium gallium nitride (InGaN) alloys offer great potential for high-efficiency photovoltaics, yet theoretical promise has not been experimentally demonstrated. Several major challenges remain including polarization effects, suitable p-type doping, improved surface passivation, and growth of thick, high-quality InGaN layers. In this paper, we present numerical simulations of InGaN p-i-n single-junction solar cells to provide guidelines for performance improvement through optimization of device structures given achievable material characteristics. The performance of both InGaN/GaN heterojunction devices that are presently achievable and InGaN homojunction solar cells that should be feasible in the future are investigated through the calculation of characteristic parameters: short-circuit current density, open-circuit voltage, and conversion efficiency. These simulations study the effect of indium content, thickness, and background doping of the unintentionally-doped InGaN absorbing layer on the performance of both InGaN solar-cell designs. While the maximum efficiency of a p-i-n InGaN/GaN heterojunction solar cell with low indium composition is 11.3%, the conversion efficiency of heterojunction devices with high indium composition needed for longer wavelength absorption drastically reduces because of polarization effects. Above an indium composition of 45%, the modeled heterojunction devices do not operate as solar cells. Using presently achievable values of minority carrier lifetime and surface recombination velocity, the maximum efficiency of InGaN single-homojunction solar cells with optimized parameters is 17%, which is significantly smaller than the theoretical maximum energy-conversion efficiency for single-junction cells. (C) 2014 Elsevier B.V. All rights reserved.
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