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  • Title: Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange.
    Author: Jo JW, Kim Y, Choi J, de Arquer FPG, Walters G, Sun B, Ouellette O, Kim J, Proppe AH, Quintero-Bermudez R, Fan J, Xu J, Tan CS, Voznyy O, Sargent EH.
    Journal: Adv Mater; 2017 Nov; 29(43):. PubMed ID: 28991386.
    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.
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