NDLI: Device fabrication using crystalline CdTe and CdTe ternary alloys grown by MBE

Content Provider	IEEE Xplore Digital Library
Author	Zaunbrecher, K. Burst, J. Seyedmohammadi, S. Malik, R. Li, J.V. Gessert, T.A. Barnes, T.
Copyright Year	2015
Description	Author affiliation: First Solar, Inc., Santa Clara, CA, USA (Seyedmohammadi, S.; Malik, R.) \|\| Nat. Renewable Energy Lab., Golden, CO, USA (Zaunbrecher, K.; Burst, J.; Li, J.V.; Gessert, T.A.; Barnes, T.)
Abstract	We fabricated epitaxial CdTe:In/CdTe:As homojunction and CdZnTe/CdTe and CdMgTe/CdTe heterojunction devices grown on bulk CdTe substrates in order to study the fundamental device physics of CdTe solar cells. Selection of emitter-layer alloys was based on passivation studies using double heterostructures as well as band alignment. Initial results show significant device integration challenges, including low dopant activation, high resistivity substrates and the development of low-resistance contacts. To date, the highest open-circuit voltage is 715 mV in a CdZnTe/CdTe heterojunction following anneal, while the highest fill factor of 52% was attained in an annealed CdTe homojunction. In general, all currentvoltage measurements show high series resistance, capacitancevoltages measurements show variable doping, and quantum efficiency measurements show low collection. Ongoing work includes overcoming the high resistance in these devices and addressing other possible device limitations such as non-optimum junction depth, interface recombination, and reduced bulk lifetime due to structural defects.
Starting Page	1
Ending Page	5
File Size	733071
Page Count	5
File Format	PDF
e-ISBN	9781479979448
DOI	10.1109/PVSC.2015.7356084
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	II-VI semiconductor materials Cadmium compounds Annealing Substrates Molecular beam epitaxial growth Temperature measurement Heterojunctions thin films epitaxial layers photovoltaic cells
Content Type	Text
Resource Type	Article

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