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Issue 37, 2016
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Solid-state colloidal CuInS2 quantum dot solar cells enabled by bulk heterojunctions

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Abstract

Colloidal copper indium sulfide (CIS) nanocrystals (NCs) are Pb- and Cd-free alternatives for use as absorbers in quantum dot solar cells. In a heterojunction with TiO2, non-annealed ligand-exchanged CIS NCs form solar cells yielding a meager power conversion efficiency (PCE) of 0.15%, with photocurrents plummeting far below predicted values from absorption. Decreasing the amount of zinc during post-treatment leads to improved mobility but marginal improvement in device performance (PCE = 0.30%). By incorporating CIS into a porous TiO2 network, we saw an overall drastic improvement in device performance, reaching a PCE of 1.16%, mainly from an increase in short circuit current density (Jsc) and fill factor (FF) and a 10-fold increase in internal quantum efficiency (IQE). We have determined that by moving from a bilayer to a bulk heterojunction architecture, we have reduced the trap-assisted recombination as seen in changes in the ideality factor, the intensity dependence of the photocurrent and transient photocurrent (TPC) and photovoltage (TPV) characteristics.

Graphical abstract: Solid-state colloidal CuInS2 quantum dot solar cells enabled by bulk heterojunctions

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Supplementary files

Article information


Submitted
14 Jul 2016
Accepted
27 Aug 2016
First published
29 Aug 2016

Nanoscale, 2016,8, 16776-16785
Article type
Paper

Solid-state colloidal CuInS2 quantum dot solar cells enabled by bulk heterojunctions

D. So, S. Pradhan and G. Konstantatos, Nanoscale, 2016, 8, 16776
DOI: 10.1039/C6NR05563J

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