Air-stable inverted structure of hybrid solar cells using a cesium-doped ZnO electron transport layer prepared by a sol–gel process
SCIE
SCOPUS
- Title
- Air-stable inverted structure of hybrid solar cells using a cesium-doped ZnO electron transport layer prepared by a sol–gel process
- Authors
- Seungchul Kwon; Kyung-Geun Lim; Myungsun Shim; Hong Chul Moon; Jicheol Park; Gumhye Jeon; Jihyun Shin; CHO, KIL WON; Lee, TW; Kim, JK
- Date Issued
- 2013-08
- Publisher
- Royal Society of Chemistry
- Abstract
- We have developed an air-stable inverted structure of poly(3-hexylthiophene) (P3HT) : cadmium selenide (CdSe) hybrid solar cells using a cesium-doped ZnO (ZnO:Cs) electron transport layer. The ZnO:Cs layer was simply prepared at low temperature by the sol-gel process using a ZnO solution containing cesium carbonate (Cs2CO3). With increasing Cs-doping concentration, the conduction band edge of ZnO is decreased, as confirmed by scanning Kelvin probe microscopy. The energy level of ZnO: Cs is effective for electron transport from CdSe. Consequently, the power conversion efficiency (PCE) of the inverted P3HT : CdSe hybrid solar cells using the ZnO: Cs electron transport layer is 1.14%, which is significantly improved over that (0.43%) of another device without Cs. X-ray photoelectron spectroscopy analysis revealed that the amount of CdSe on the substrate (or the bottom surface) is larger compared with the air (or top) surface regardless of the P3HT : CdSe weight ratio. The vertically inhomogeneous distribution of CdSe in the hybrid solar cells gives better charge transport from CdSe to ZnO:Cs in the inverted structure of the device compared with that in the normal structure. As a result, the inverted hybrid solar cell consisting of 1 : 4 (wt/wt) P3HT : CdSe shows the best efficiency, while the best efficiency of a normal hybrid solar cell is achieved at 1 : 9 (wt/wt) P3HT : CdSe.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15140
- DOI
- 10.1039/C3TA12425H
- ISSN
- 2050-7488
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, vol. 1, no. 38, page. 11802 - 11808, 2013-08
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