Two-step annealed CdS/CdSe co-sensitizers for quantum dot-sensitized solar cells
- Two-step annealed CdS/CdSe co-sensitizers for quantum dot-sensitized solar cells
- 정성우; 박민아; 김재홍; 김현수[김현수]; 최철종[최철종]; 강순형[강순형]; 안광순
- TIO2 FILMS; CDSE; EFFICIENCY; ARRAYS
- Issue Date
- ELSEVIER SCIENCE BV
- CURRENT APPLIED PHYSICS, v.13, no.7, pp.1532 - 1536
- CdS/CdSe co-sensitizers on TiO2 films were annealed using a two-step procedure; high temperature (300 degrees C) annealing of TiO2/CdS quantum dots (QDs), followed by low temperature (150 degrees C) annealing after the deposition of CdSe QDs on the TiO2/CdS. For comparison, two types of films were prepared; CdS/CdSe-assembled TiO2 films conventionally annealed at a single temperature (150 or 300 degrees C) and nonannealed films. The 300 degrees C-annealed TiO2/CdS/CdSe showed severe coalescence of CdSe QDs, leading to the blocked pores and hindered ion transport. The QD-sensitized solar cell (QD-SSC) with the 150 degrees C-annealed TiO2/CdS/CdSe exhibited better overall energy conversion efficiency than that with the nonannealed TiO2/CdS/CdSe because the CdSe QDs annealed at a suitable temperature (150 degrees C) provided better light absorption over long wavelengths without the hindered ion transport. The QD-SSC using the two-step annealed TiO2/CdS/CdSe increased the cell efficiency further, compared to the QD-SSC with the 150 degrees C-annealed TiO2/CdS/CdSe. This is because the 300 degrees C-annealed, highly crystalline CdS in the two-step annealed TiO2/CdS/CdSe improved electron transport through CdS, leading to a significantly hindered recombination rate. (C) 2013 Elsevier B.V. All rights reserved.
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