Interface Recombination in Depleted Heterojunction Photovoltaics based on Colloidal Quantum Dots

Kyle W. Kemp, Andre J. Labelle, Susanna M. Thon, Alexander H. Ip, Illan J. Kramer, Sjoerd Hoogland, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

Interface recombination was studied in colloidal quantum dot photovoltaics. Optimization of the TiO2 -PbS interface culminated in the introduction of a thin ZnO buffer layer deposited with atomic layer deposition. Transient photovoltage measurements indicated a nearly two-fold decrease in the recombination rate around 1 sun operating conditions. Improvement to the recombination rate led to a device architecture with superior open circuit voltage (VOC) and photocurrent extraction. Overall a 10% improvement in device efficiency was achieved with Voc enhancements up to 50 mV being realized. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)917-922
Number of pages6
JournalAdvanced Energy Materials
Volume3
Issue number7
DOIs
StatePublished - Mar 26 2013
Externally publishedYes

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