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Enhancing PbS Colloidal Quantum Dot Tandem Solar Cell Performance by Graded Band Alignment
Univ New South Wales, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia.
Univ New South Wales, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia.
Univ New South Wales, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia;Swinburne Univ Technol, Ctr Translat Atomat, Hawthorn, Vic 3122, Australia.ORCID iD: 0000-0001-8394-2391
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Univ New South Wales, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia.ORCID iD: 0000-0003-1038-9980
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 19, p. 5729-5734Article in journal (Refereed) Published
Abstract [en]

Colloidal quantum dot solids are attractive candidates for tandem solar cells because of their widely tunable bandgaps. However, the development of the quantum dot tandem solar cell has lagged far behind that of its single-junction counterpart. One of the fundamental problems with colloidal quantum dot solar cells is the relatively small diffusion length, which limits the quantum dot absorbing layer thickness and hence the power conversion efficiency. In this research, guided by optical modeling and utilizing a graded band alignment strategy, a two-terminal monolithic solution-processed quantum dot tandem solar cell has been successfully fabricated and a power conversion efficiency of 6.8% has been achieved. The band grading approach utilized the complementary tuning of work functions and band alignment through judicious choices of the nanoparticle surface chemistry and quantum dot confined size. This work demonstrates a general approach to improving the efficiency for tandem thin-film solar cells.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 10, no 19, p. 5729-5734
National Category
Physical Chemistry Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-396728DOI: 10.1021/acs.jpclett.9b02423ISI: 000489189500007PubMedID: 31510742OAI: oai:DiVA.org:uu-396728DiVA, id: diva2:1374344
Funder
Australian Research Council, DP14140102073Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2019-12-12Bibliographically approved

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Yuan, Lin

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