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Title: 14%-efficient flexible CdTe solar cells on ultra-thin glass substrates

Flexible glass enables high-temperature, roll-to-roll processing of superstrate devices with higher photocurrents than flexible polymer foils because of its higher optical transmission. Using flexible glass in our high-temperature CdTe process, we achieved a certified record conversion efficiency of 14.05% for a flexible CdTe solar cell. Little has been reported on the flexibility of CdTe devices, so we investigated the effects of three different static bending conditions on device performance. We observed a consistent trend of increased short-circuit current and fill factor, whereas the open-circuit voltage consistently dropped. The quantum efficiency under the same static bend condition showed no change in the response. After storage in a flexed state for 24 h, there was very little change in device efficiency relative to its unflexed state. This indicates that flexible glass is a suitable replacement for rigid glass substrates, and that CdTe solar cells can tolerate bending without a decrease in device performance.
Authors:
; ; ; ; ;  [1] ; ;  [2] ; ;  [3]
  1. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)
  2. Colorado School of Mines, Golden, Colorado 80401 (United States)
  3. Corning Incorporated, Corning, New York 14831 (United States)
Publication Date:
OSTI Identifier:
22261555
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM TELLURIDES; FILL FACTORS; FLEXIBILITY; GLASS; PHOTOCURRENTS; POLYMERS; QUANTUM EFFICIENCY; SOLAR CELLS; SUBSTRATES