ZnS-Passivated CdSe/CdS Co-sensitized Mesoporous Zn2SnO4 Based Solar Cells

Title
ZnS-Passivated CdSe/CdS Co-sensitized Mesoporous Zn2SnO4 Based Solar Cells
Authors
김경호박지은박은수박윤창김주선임찬이만종
Keywords
Zn2SnO4; CdSe/CdS QDs; Sensitized Solar Cells; ZnS passivation; Electrochemical impedance
Issue Date
2014-03
Publisher
Electrochimica acta
Citation
VOL 121, 223-232
Abstract
CdS and CdSe/CdS quantum dot (QD) sensitizers were assembled onto mesoporous ternary Zn2SnO4 photoanodes using a two-step sequential process of successive ionic layer absorption and reaction (SILAR) and chemical bath deposition (CBD) for QD-cosensitized solar cell applications. The assembled CdS and CdSe QDs were observed using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), high-resolution TEM (HRTEM), and STEM/energy-dispersive X-ray spectroscopy (EDS) elemental mapping. CdSe/CdS cosensitized Zn2SnO4-based cells showed a higher absorption onset position, a stepwise band-edge level alignment, and, thereby, an improved power conversion efficiency (PCE) of 1.628% under one-sun conditions, which is the best result obtained using mesoporous Zn2SnO4 reported to date. In addition, the effect of a ZnS passivation layer on the photovoltaic performance and aging behavior has been investigated. Electrochemical impedance spectroscopy (EIS) showed that the main role of the ZnS layer is to enhance the aging behavior of the CdSe/CdS/Zn2SnO4 cells by improving the electron lifetime and charge recombination.
URI
http://pubs.kist.re.kr/handle/201004/47137
ISSN
00134686
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KIST Publication > Article
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