Passivation Using Molecular Halides Increases Quantum Dot Solar Cell Performance

Xinzheng Lan; Oleksandr Voznyy; Amirreza Kiani; F Pelayo García de Arquer; Abdullah Saud Abbas; Gi-Hwan Kim; Mengxia Liu; Zhenyu Yang; Grant Walters; Jixian Xu; Mingjian Yuan; Zhijun Ning; Fengjia Fan; Pongsakorn Kanjanaboos; Illan Kramer; David Zhitomirsky; Philip Lee; Alexander Perelgut; Sjoerd Hoogland; Edward H Sargent

doi:10.1002/adma.201503657

Passivation Using Molecular Halides Increases Quantum Dot Solar Cell Performance

Adv Mater. 2016 Jan 13;28(2):299-304. doi: 10.1002/adma.201503657. Epub 2015 Nov 18.

Authors

Xinzheng Lan¹, Oleksandr Voznyy¹, Amirreza Kiani¹, F Pelayo García de Arquer¹, Abdullah Saud Abbas¹, Gi-Hwan Kim¹, Mengxia Liu¹, Zhenyu Yang¹, Grant Walters¹, Jixian Xu¹, Mingjian Yuan¹, Zhijun Ning², Fengjia Fan¹, Pongsakorn Kanjanaboos¹, Illan Kramer¹, David Zhitomirsky¹, Philip Lee¹, Alexander Perelgut¹, Sjoerd Hoogland¹, Edward H Sargent¹

Affiliations

¹ Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
² School of Physical Science and Technology, Shanghai Tech University, 100 Haike Rd., Pudong New Area, Shanghai, 201210, China.

PMID: 26576685
DOI: 10.1002/adma.201503657

Abstract

A solution-based passivation scheme is developed featuring the use of molecular iodine and PbS colloidal quantum dots (CQDs). The improved passivation translates into a longer carrier diffusion length in the solid film. This allows thicker solar-cell devices to be built while preserving efficient charge collection, leading to a certified power conversion efficiency of 9.9%, which is a new record in CQD solar cells.

Keywords: PbS quantum dots; molecular iodine; passivation; solar cells.