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Enhanced Charge Carrier Extraction by Highly Ordered Wrinkled MgZnO Thin Film for Colloidal Quantum Dot Solar Cells

Abstract

Efficient charge carrier extraction from a colloidal quantum dot (CQD) solid is crucial for high performance CQD solar cells (CQDSCs). Herein, highly ordered wrinkled MgZnO (MZO) thin films are demonstrated to improve the charge carrier extraction from PbS CQDSCs. The highly ordered wrinkled MZO thin films are prepared using a low-temperature combustion method. The photovoltaic performance of the CQDSCs with the combustion-processed MZO (CP-MZO) thin film as an electron transport material (ETM) are compared to the CQDSCs with conventional sol-gel processed MZO (SGP-MZO) thin film as an ETM. We perform photoluminescence quenching measurements of the colloidal quantum dot (CQD) solid and charge carrier dynamic analysis of full solar cell devices. The results show that the highly ordered wrinkled CP-MZO thin film significantly increases the charge carrier extraction from the CQD solid and therefore diminishes the charge interfacial recombination at the CQD/ETM junction, leading to a 15.5% increase in power conversion efficiency. The improved efficiency in the CP-MZO based CQDSC is also contributed to the compact and pin-hole free CP-MZO thin film.

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Publication details

The article was received on 20 Jun 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC02740K
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Enhanced Charge Carrier Extraction by Highly Ordered Wrinkled MgZnO Thin Film for Colloidal Quantum Dot Solar Cells

    X. Zhang, K. Welch, L. Tian, M. B. Johansson, L. Häggman, J. Liu and E. M. J. Johansson, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02740K

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