Trap-assisted transport and non-uniform charge distribution in sulphur-rich PbS colloidal quantum dot-based solar cells with selective contacts

Authors

Victor Malgras, University of WollongongFollow
Guanran Zhang, University of WollongongFollow
Andrew Nattestad, University of WollongongFollow
Tracey M. Clarke, University of WollongongFollow
Attila J. Mozer, University of WollongongFollow
Yusuke Yamauchi, National Institute for Materials Science, TsukubaFollow
Jung Ho Kim, University of WollongongFollow

RIS ID

103854

Publication Details

Malgras, V., Zhang, G., Nattestad, A., Clarke, T. M., Mozer, A. J., Yamauchi, Y. & Kim, J. (2015). Trap-assisted transport and non-uniform charge distribution in sulphur-rich PbS colloidal quantum dot-based solar cells with selective contacts. ACS Applied Materials and Interfaces, 7 (48), 26455-26460.

Abstract

This study reports evidences of dispersive transport in planar PbS colloidal quantum dots heterojunction-based devices as well as the effect of incorporating a MoO3 hole selective layer on the charge extraction behavior. Steady state and transient characterization techniques are employed to determine the complex recombination processes involved in such devices. The addition of a selective contact drastically improves the device efficiency up to 3.15 % (especially through the photocurrent and series resistance) and extends the overall charge lifetime by suppressing the main first-order recombination pathway observed in device without MoO3. The lifetime and mobility calculated for our sulphur-rich PbS-based devices are similar to previously reported values in lead-rich quantum dots-based solar cells. Nevertheless, strong Shockley-Read-Hall mechanisms appears to keep restricting charge transport, the equilibrium voltage taking more than 1 ms to be established.

Grant Number

ARC/DP1096546

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP1096546