Defect states in hybrid solar cells consisting of Sb2S3 quantum dots and TiO2 nanoparticles
- Authors
- Lee, Dong Uk; Pak, Sang Woo; Cho, Seong Gook; Kim, Eun Kyu; Seok, Sang Il
- Issue Date
- Jul-2013
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.103, no.2, pp.1 - 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 103
- Number
- 2
- Start Page
- 1
- End Page
- 5
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/162435
- DOI
- 10.1063/1.4813272
- ISSN
- 0003-6951
- Abstract
- We have studied defect states in an organic-inorganic hybrid solar cell containing Sb2S3 quantum dots (QDs) and TiO2 nanoparticles (NPs) by using deep level transient spectroscopy (DLTS). An Au electrode was deposited as a Schottky contact on the sample, where the Sb2S3 QDs were distributed on the surface of TiO2 NPs by chemical synthesis. The activation energy and capture-cross section of an interface state between the Sb2S3 QDs and the TiO2 NPs were found to be about 0.78 eV and 2.21 x 10(-9) cm(-2), respectively. Also, the densities of this interface trap under a measurement voltage of -1 V were approximately 2.5 x 10(17) cm(-3). Based on these results, the interface trap was positioned around E-c - 1.03 eV below the conduction band edge of Sb2S3 QD. Thus, the external quantum efficiency of the solar cell was affected because of its role as a recombination center for carriers generated from Sb2S3 QDs.
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