In the present manuscript, we report for the first time Cu 2ZnSnS4 (CZTS)-based heterojunction (p-CZTS/n-ZnO) used for room temperature liquefied petroleum gas (LPG) sensing. Specifically, the nanostructured ZnO has been grown chemically onto the sputtered CZTS thin films. The formations of phase pure CZTS and ZnO are confirmed by X-ray diffraction studies. The high quality heterojunction between compact CZTS and nanosized ZnO is obtained. At room temperature, the CZTS-based heterojunction exhibited gas response of 19.3% upon exposure to 1200 ppm of LPG with faster response and recovery time of 70 and 40 s.
Bibliographical noteFunding Information:
This work is supported by Human Resource and Development of the Korea Institute of Energy Technology Evolution and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge and Economy (No. 20124010203180 ) and was partially funded by National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST-No. 2011-0016564 ) and was supported by the Center for inorganic photovoltaic materials (No. 2012-0001170 ) grant funded by the Korea government (MEST) .
- CZTS thin film
- Gas response
- Gas sensing mechanism
- Nanosized ZnO thin film
- Room temperature LPG sensor
- p-CZTS/n-ZnO heterojunction