Synergistic doping of fullerene electron transport layer and colloidal quantum dot solids enhances solar cell performance

Mingjian Yuan; Oleksandr Voznyy; David Zhitomirsky; Pongsakorn Kanjanaboos; Edward H Sargent

doi:10.1002/adma.201404411

Synergistic doping of fullerene electron transport layer and colloidal quantum dot solids enhances solar cell performance

Adv Mater. 2015 Feb 4;27(5):917-21. doi: 10.1002/adma.201404411. Epub 2014 Dec 12.

Authors

Mingjian Yuan¹, Oleksandr Voznyy, David Zhitomirsky, Pongsakorn Kanjanaboos, Edward H Sargent

Affiliation

¹ Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.

PMID: 25504558
DOI: 10.1002/adma.201404411

Abstract

The spatial location of the predominant source of performance-limiting recombination in today's best colloidal quantum dot (CQD) cells is identified, pinpointing the TiO2:CQD junction; then, a highly n-doped PCBM layer is introduced at the CQD:TiO2 heterointerface. An n-doped PCBM layer is essential to maintain the depletion region and allow for efficient current extraction, thereby producing a record 8.9% in overall power conversion efficiency.

Keywords: PbS; [6,6]-phenyl-61-butyric acid methyl ester (PCBM); colloidal quantum dots; depleted heterojunctions; photovoltaics.