Document Type

Journal Article

Department/Unit

Department of Physics

Title

Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI2/CH3NH3I multilayers

Language

English

Abstract

© The Royal Society of Chemistry 2015. We report, for the first time, on the synthesis of perovskite films by thermal annealing of evaporated lead(ii) iodide (PbI2)/methylammonium iodide (CH3NH3I) multilayers. Detailed characterization of the resulting films is presented. Our work demonstrates that compact, high quality and uniform perovskite films can be grown using this technique. Optimization of the device structure was achieved by careful design of the layer thickness and the number of PbI2/CH3NH3I pairs used in the formation of the absorber layer. Utilizing additional annealing steps in a controlled atmosphere was shown to result in significant improvement in the device performance. Our experimental data indicate that O2 treatments may result in substantial reduction in the trap density of the device and thereby significant improvement in the lifetimes of the carriers. A high power conversion efficiency (PCE) of 12.5% was recorded for the champion device.

Publication Date

2015

Source Publication Title

Journal of Materials Chemistry A

Volume

3

Issue

17

Start Page

9223

End Page

9231

Publisher

Royal Society of Chemistry

DOI

10.1039/c4ta05070c

Link to Publisher's Edition

http://dx.doi.org/10.1039/c4ta05070c

ISSN (print)

20507488

ISSN (electronic)

20507496

This document is currently not available here.

Share

COinS