Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange
AuthorsJo, Jea Woong
de Arquer, F. Pelayo García
Proppe, Andrew H.
Tan, Chih Shan
Sargent, Edward H.
KAUST Grant NumberOSR-2017-CPF-3325
Permanent link to this recordhttp://hdl.handle.net/10754/626077
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AbstractThe energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (VOC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a VOC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved.
CitationJo JW, Kim Y, Choi J, de Arquer FPG, Walters G, et al. (2017) Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange. Advanced Materials: 1703627. Available: http://dx.doi.org/10.1002/adma.201703627.
SponsorsJ.W.J., Y.K., and J.C. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2016R1A6A3A03007170 and 2016R1A6A3A03009820), by Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7), by King Abdullah University of Science and Technology (KAUST, Office of Sponsored Research (OSR), Award No. OSR-2017-CPF-3325), and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. O.O. was financially supported by NSERC’s Postgraduate Scholarships-Doctoral program. The authors thank L. Levina, R. Wolowiec, D. Kopilovic, and E. Palmiano for their help over the course of this research.