期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 2, 期 4, 页码 434-440出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2012.2206568
关键词
Photovoltaic cells; semiconductor diodes; semiconductor films; silicon compounds
资金
- National Science Foundation [DMR-0907600]
- Department of Energy [DE-FG36-08GO18003]
- U.S. Air Force [DOD AFOSR FA9550-12-1-0208]
- Emcore Corporation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907600] Funding Source: National Science Foundation
Ge1-x-ySixSny alloys have reached a level of maturity that permits the creation of prototype devices on group-IV platforms. Here, we compare the optical and electrical properties of GeSiSn diodes with similar target compositions (Si; 10-11%, Sn; 1.7-2.3%) grown directly on Si(100) and Ge( 100) using low-temperature ultrahigh vacuum chemical vapor deposition reactions of designer hydrides. The diodes grown on Ge substrates have relatively low ideality factors in the 1.3-1.4 range and low dark currents with a sizable diffusion component. The corresponding characteristics of the analogous devices grown on Si are significantly degraded due to mismatch-induced reduction in crystal quality. Quantum efficiency measurements show that both sets of diodes have absorption edges near 1 eV with collection efficiencies reaching at least 76% in the devices grown on Ge. Collectively, these results suggest that Ge1-x-ySixSny alloys represent a viable alternative as the long sought photovoltaic material with a lattice constant equal to that of Ge and a bandgap around 1 eV.
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