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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Monolayers

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Title
High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Monolayers
Author
Kim, Gi-Hwande Arquer, F. Pelayo GarciaYoon, Yung JinLan, XinzhengLiu, MengxiaVoznyy, OleksandrYang, ZhenyuFan, FengjiaIp, Alexander H.Kanjanaboos, PongsakornHoogland, SjoerdKim, Jin YoungSargent, Edward H.
Issue Date
2015-11
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.15, no.11, pp.7691 - 7696
Abstract
The optoelectronic tunability offered by colloidal quantum dots (CQDs) is attractive for photovoltaic applications but demands proper band alignment at electrodes for efficient charge extraction at minimal cost to voltage. With this goal in mind, self-assembled monolayers (SAMs) can be used to modify interface energy levels locally. However, to be effective SAMs must be made robust to treatment using the various solvents and ligands required for to fabricate high quality CQD solids. We report robust self-assembled monolayers (R-SAMs) that enable us to increase the efficiency of CQD photovoltaics. Only by developing a process for secure anchoring of aromatic SAMs, aided by deposition of the SAMs in a water-free deposition environment, were we able to provide an interface modification that was robust against the ensuing chemical treatments needed in the fabrication of CQD solids. The energy alignment at the rectifying interface was tailored by tuning the R-SAM for optimal alignment relative to the CQD quantum-confined electron energy levels. This resulted in a CQD PV record power conversion efficiency (PCE) of 10.7% with enhanced reproducibility relative to controls.
URI
https://scholarworks.unist.ac.kr/handle/201301/17886
URL
http://pubs.acs.org/doi/10.1021/acs.nanolett.5b03677
DOI
10.1021/acs.nanolett.5b03677
ISSN
1530-6984
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