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Low-Temperature-Processed 9% Colloidal Quantum Dot Photovoltaic Devices through Interfacial Management of p-n Heterojunction

Title
Low-Temperature-Processed 9% Colloidal Quantum Dot Photovoltaic Devices through Interfacial Management of p-n Heterojunction
Authors
Azmi, RandiAqoma, HavidHadmojo, Wisnu TantyoYun, Jin-MunYoon, SoyeonKim, KyungkonDo, Young RagOh, Seung-HwanJang, Sung-Yeon
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2016
Journal Title
ADVANCED ENERGY MATERIALS
ISSN
1614-6832JCR Link1614-6840JCR Link
Citation
vol. 6, no. 8
Publisher
WILEY-V C H VERLAG GMBH
Indexed
SCIE; SCOPUS WOS scopus
Abstract
Low-temperature solution-processed high-efficiency colloidal quantum dot (CQD) photovoltaic devices are developed by improving the interfacial properties of p-n heterojunctions. A unique conjugated polyelectrolyte, WPF-6-oxy-F, is used as an interface modification layer for ZnO/PbS-CQD heterojunctions. With the insertion of this interlayer, the device performance is dramatically improved. The origins of this improvement are determined and it is found that the multifunctionality of the WPF-6-oxy-F interlayer offers the following essential benefits for the improved CQD/ZnO junctions: (i) the dipole induced by the ionic substituents enhances the quasi-Fermi level separation at the heterojunction through favorable energy band-bending, (ii) the ethylene oxide groups containing side chains can effectively passivate the interfacial defect sites of the heterojunction, and (iii) these effects occur without deterioration in the intrinsic depletion region or the series resistance of the device. All of the figures-of-merit of the devices are improved as a result of the enhanced built-in potential (electric field) and the reduced interfacial charge recombination at the heterojunction. The benefits due to the WPF-6-oxy-F interlayer are generally applicable to various types of PbS/ZnO heterojunctions. Finally, CQD photovoltaic devices with a power conversion efficiency of 9% are achievable, even by a solution process at room temperature in an air atmosphere. The work suggests a useful strategy to improve the interfacial properties of p-n heterojunctions by using polymeric interlayers.
DOI
10.1002/aenm.201502146
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자연과학대학 > 화학·나노과학전공 > Journal papers
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