Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kinetics
Kemp, Kyle W.
Sargent, Edward H.
KAUST Grant NumberKUS-11-009-21
MetadataShow full item record
AbstractColloidal quantum dot solar cells achieve spectrally selective optical absorption in a thin layer of solution-processed, size-effect tuned, nanoparticles. The best devices built to date have relied heavily on drift-based transport due to the action of an electric field in a depletion region that extends throughout the thickness of the quantum dot layer. Here we study for the first time the behaviour of the best-performing class of colloidal quantum dot films in the absence of an electric field, by screening using an electrolyte. We find that the action of selective contacts on photovoltage sign and amplitude can be retained, implying that the contacts operate by kinetic preferences of charge transfer for either electrons or holes. We develop a theoretical model to explain these experimental findings. The work is the first to present a switch in the photovoltage in colloidal quantum dot solar cells by purposefully formed selective contacts, opening the way to new strategies in the engineering of colloidal quantum dot solar cells. © 2013 Macmillan Publishers Limited. All rights reserved.
CitationMora-Sero I, Bertoluzzi L, Gonzalez-Pedro V, Gimenez S, Fabregat-Santiago F, et al. (2013) Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kinetics. Nat Comms 4. Available: http://dx.doi.org/10.1038/ncomms3272.
SponsorsWe thank the following agencies for support of this research: Ministerio de Educacion y Ciencia under project HOPE CSD2007-00007, Generalitat Valenciana (ISIC/2012/008) and Universitat Jaume I project 12I361.01/1. EHS and KWK acknowledge the Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST) and the International Cooperation of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (2012T100100740).
CollectionsPublications Acknowledging KAUST Support
Except where otherwise noted, this item's license is described as Open access articles are published under a CC BY license (Creative Commons Attribution 4.0 International License).
- Low-temperature solution-processed solar cells based on PbS colloidal quantum dot/CdS heterojunctions.
- Authors: Chang LY, Lunt RR, Brown PR, Bulović V, Bawendi MG
- Issue date: 2013 Mar 13
- Use of Surface Photovoltage Spectroscopy to Measure Built-in Voltage, Space Charge Layer Width, and Effective Band Gap in CdSe Quantum Dot Films.
- Authors: Zhao J, Nail BA, Holmes MA, Osterloh FE
- Issue date: 2016 Sep 1
- Depleted-heterojunction colloidal quantum dot solar cells.
- Authors: Pattantyus-Abraham AG, Kramer IJ, Barkhouse AR, Wang X, Konstantatos G, Debnath R, Levina L, Raabe I, Nazeeruddin MK, Grätzel M, Sargent EH
- Issue date: 2010 Jun 22
- Preventing interfacial recombination in colloidal quantum dot solar cells by doping the metal oxide.
- Authors: Ehrler B, Musselman KP, Böhm ML, Morgenstern FS, Vaynzof Y, Walker BJ, Macmanus-Driscoll JL, Greenham NC
- Issue date: 2013 May 28
- The donor-supply electrode enhances performance in colloidal quantum dot solar cells.
- Authors: Maraghechi P, Labelle AJ, Kirmani AR, Lan X, Adachi MM, Thon SM, Hoogland S, Lee A, Ning Z, Fischer A, Amassian A, Sargent EH
- Issue date: 2013 Jul 23