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Progress in p(+)n InP solar cells fabricated by thermal diffusionThe performance results of our most recently thermally diffused InP solar cells using the p(+)n (Cd,S) structures are presented. We have succeeded in fabricating cells with measured AMO, 25 C V(sub oc) exceeding 880 mV (bare cells) which to the best of our knowledge is higher than previously reported V(sub oc) values for any InP homojunction solar cells. The cells were fabricated by thinning the emitter, after Au-Zn front contacting, from its initial thickness of about 4.5 microns to about 0.6 microns. After thinning, the exposed surface of the emitter was passivated by a thin (approximately 50A) P-rich oxide. Based on the measured EQY and J(sub sc)-V(sub oc) characteristics of our experimental high V(sub oc) p(+)n InP solar cells, we project that reducing the emitter thickness to 0.3 microns, using an optimized AR coating, maintaining the surface hole concentration of 3 x 10(exp 18)cm(sup -3), reducing the grid shadowing from actual 10.55 percent to 6 percent and reducing the contact resistance will increase the actual measured 12.57 percent AMO 25 C efficiency to about 20.1 percent. By using our state-of-the-art p(+)n structures which have a surface hole concentration of 4 x 10(exp 18)cm(sup -3) and slightly improving the front surface passivation, an even higher practically achievable AMO, 25 C efficiency of 21.3 percent is projected.
Document ID
19940006912
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Flood, D. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Brinker, D. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Weinberg, I.
(NASA Lewis Research Center Cleveland, OH, United States)
Vargas, C.
(NASA Lewis Research Center Cleveland, OH, United States)
Faur, Mircea
(Cleveland State Univ. OH., United States)
Faur, Maria
(Cleveland State Univ. OH., United States)
Goradia, C.
(Cleveland State Univ. OH., United States)
Goradia, M.
(Cleveland State Univ. OH., United States)
Fatemi, N. S.
(Sverdrup Technology, Inc. Cleveland, OH., United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1993
Publication Information
Publication: Proceedings of the 12th Space Photovoltaic Research and Technology Conference (SPRAT 12)
Subject Category
Spacecraft Propulsion And Power
Accession Number
94N11384
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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