Open-Circuit Voltage Deficit, Radiative Sub-Bandgap States, and Prospects in Quantum Dot Solar Cells

Title
Open-Circuit Voltage Deficit, Radiative Sub-Bandgap States, and Prospects in Quantum Dot Solar Cells
Authors
황규원Chia-Hao Marcus ChuangAndrea MauranoRiley E. BrandtJoel JeanTonio BuonassisiVladimir BulovicMoungi G. Bawendi
Keywords
PbS; photovoltaics; quantum dot; solar energy; sub-bandgap state
Issue Date
2015-05
Publisher
Nano letters
Citation
VOL 15, NO 5-3294
Abstract
Quantum dot photovoltaics (QDPV) offer the potential for low-cost solar cells. To develop strategies for continued improvement in QDPVs, a better understanding of the factors that limit their performance is essential. Here, we study carrier recombination processes that limit the power conversion efficiency of PbS QDPVs. We demonstrate the presence of radiative sub-bandgap states and sub-bandgap state filling in operating devices by using photoluminescence (PL) and electroluminescence (EL) spectroscopy. These sub-bandgap states are most likely the origin of the high open-circuit-voltage (V-OC) deficit and relatively limited carrier collection that have thus far been observed in QDPVs. Combining these results with our perspectives on recent progress in QDPV, we conclude that eliminating sub-bandgap states in PbS QD films has the potential to show a greater gain than may be attainable by optimization of interfaces between QDs and other materials. We suggest possible future directions that could guide the design of high-performance QDPVs.
URI
http://pubs.kist.re.kr/handle/201004/65238
ISSN
1530-6984
Appears in Collections:
KIST Publication > Article
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