Advanced Materials
Advanced Materials
3 years ago

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

Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange
Bin Sun, Younghoon Kim, Chih Shan Tan, Jea Woong Jo, F. Pelayo García Arquer, James Fan, Olivier Ouellette, Oleksandr Voznyy, Andrew H. Proppe, Grant Walters, Jongmin Choi, Jixian Xu, Rafael Quintero-Bermudez, Junghwan Kim, Edward H. Sargent
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. A new solution-phase ligand exchange method for preventing colloidal quantum dots fusion and etching is developed via judicious incorporation of reactivity-engineered additives. This method provides improved monodispersity in final colloidal quantum dot films and thus leads to the significant enhancement of open-circuit voltages in colloidal quantum dot solar cells.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201703627

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