Enhanced Power Conversion Efficiency via Hybrid Ligand Exchange Treatment of p-Type PbS Quantum Dots

Teh, Zhi LiUniv New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia (author)

PbS quantum dot solar cells (QDSCs) have emerged as a promising low-cost, solution-processable solar energy harvesting device and demonstrated good air stability and potential for large-scale commercial implementation. PbS QDSCs achieved a record certified efficiency of 12% in 2018 by utilizing an n+–n–p device structure. However, the p-type layer has generally suffered from low carrier mobility due to the organic ligand 1,2-ethanedithiol (EDT) that is used to modify the quantum dot (QD) surface. The low carrier mobility of EDT naturally limits the device thickness as the carrier diffusion length is limited by the low mobility. Herein, we improve the properties of the p-type layer through a two-step hybrid organic ligand treatment. By treating the p-type layer with two types of ligands, 3-mercaptopropionic acid (MPA) and EDT, the PbS QD surface was passivated by a combination of the two ligands, resulting in an overall improvement in open-circuit voltage, fill factor, and current density, leading to an improvement in the cell efficiency from 7.0 to 10.4% for the champion device. This achievement was a result of the improved QD passivation and a reduction in the interdot distance, improving charge transport through the p-type PbS quantum dot film.

Hu, LongUniv New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia (author)
Zhang, ZhilongUniv Cambridge, Cavendish Lab, Cambridge CB3 0HE, England (author)
Gentle, Angus R.Univ Technol Sydney, Sch Math & Phys Sci, Ultimo, NSW 2007, Australia (author)
Chen, ZihanUniv New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia (author)
Gao, YijunUniv New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia (author)
Yuan, LinUppsala universitet,Fysikalisk kemi(Swepub:uu)linyu228 (author)
Hu, YicongUniv New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia (author)
Wu, TomUniv New South Wales UNSW, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia (author)
Patterson, Robert J.Univ New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia (author)
Huang, ShujuanUniv New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia; Macquarie Univ, Sch Engn, Sydney, NSW 2109, Australia (author)
Univ New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, AustraliaUniv Cambridge, Cavendish Lab, Cambridge CB3 0HE, England (creator_code:org_t)

In:ACS Applied Materials and Interfaces: American Chemical Society (ACS)12:20, s. 22751-227591944-82441944-8252

By the author/editor: Teh, Zhi Li; Hu, Long; Zhang, Zhilong; Gentle, Angus R.; Chen, Zihan; Gao, Yijun; show more...; Yuan, Lin; Hu, Yicong; Wu, Tom; Patterson, Rober ...; Huang, Shujuan; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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