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Proceedings Paper

Tandem self-powered photovoltaic-electrochromic window coatings
Author(s): John N. Bullock; Yueqin Xu; David K. Benson; Howard M. Branz
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Paper Abstract

Wide-gap, transparent amorphous silicon based photovoltaics can be integrated with electrochromic materials to produce a self-powered 'smart' window coating. Existing electrochromic window designs require an external electrical connection, which may be economically unfeasible. This problem is solved by the tandem photovoltaic-electrochromic (PV/EC) device, in which a wide-gap amorphous silicon-based alloy (a-SiC:H) photovoltaic device is deposited together with an electrochromic optical transmittance modulator in a monolithic device on a single substrate. In this paper, we discuss our proposed monolithic photovoltaic-electrochromic device. We also present studies of transparent, wide-gap (Tauc gap of 1.8 to 2.2 eV) amorphous silicon-carbon thin films and p-i-n devices designed for use in the photovoltaic-electrochromic device. The photovoltaic cells in the PV-EC can operate at low current (< 1 mA/cm2) because a total injected charge of only 60 (mu) C/cm2 will darken the EC layer to a visible transmission of 5%, but they will need a high open-circuit voltage (> 1.0 V) and high transparency (approximately equals 70%). We describe our progress toward these design targets.

Paper Details

Date Published: 23 August 1995
PDF: 7 pages
Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); doi: 10.1117/12.217348
Show Author Affiliations
John N. Bullock, National Renewable Energy Lab. (United States)
Yueqin Xu, National Renewable Energy Lab. (United States)
David K. Benson, National Renewable Energy Lab. (United States)
Howard M. Branz, National Renewable Energy Lab. (United States)


Published in SPIE Proceedings Vol. 2531:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV
Carl M. Lampert; Satyen K. Deb; Claes-Goeran Granqvist, Editor(s)

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