Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange

Jea Woong Jo, Younghoon Kim, Jongmin Choi, F. Pelayo García de Arquer, Grant Walters, Bin Sun, Olivier Ouellette, Junghwan Kim, Andrew H. Proppe, Rafael Quintero-Bermudez, James Fan, Jixian Xu, Chih Shan Tan, Oleksandr Voznyy, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

The 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.
Original languageEnglish (US)
Pages (from-to)1703627
JournalAdvanced Materials
Volume29
Issue number43
DOIs
StatePublished - Oct 9 2017
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): OSR-2017-CPF-3325
Acknowledgements: J.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.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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