Bifacial structures of ZnS humidity sensor and Cd-free CIGS photovoltaic cell as a self-powered device

Han Ting Hsueh, Yu Jen Hsiao, Yu De Lin, Chung Lin Wu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this letter, a ZnS humidity sensor was integrated with MgF2/ZnS/CuIn1-xGaxSe2 (CIGS)/Mo photovoltaic cell as a self-powered device. Both the ZnS layers of this bifacial device were deposited at the same time by a one-step process. This ZnS layer not only serves as the buffer layer of the CIGS photovoltaic cell on the upside, but is also used as the humidity sensing material on the backside. Under 1-sun illumination, the humidity current increased monotonically from 0.045 to 12.63 nA as we increased the related humidity (RH) from 30% to 95%. At RH 95%, the humidity current decreased from 13.1 to 4.93 nA while the illumination decreased from 1 to 0.1 sun. These results indicate that this device is of practical use as a self-powered humidity sensor.

Original languageEnglish
Article number6932445
Pages (from-to)1272-1274
Number of pages3
JournalIEEE Electron Device Letters
Volume35
Issue number12
DOIs
Publication statusPublished - 2014 Dec 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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