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Low temperature reactively sputtered crystalline TiO2 thin film as effective blocking layer for perovskite solar cells

journal contribution
posted on 2017-08-31, 00:00 authored by Gayathri Devi RajmohanGayathri Devi Rajmohan, F Z Huang, R d'Agostino, J du Plessis, Xiujuan Dai
A uniform and compact hole blocking layer is necessary for a high performance perovskite solar cells, as it not only serves as an electron collector but also represses the electron recombination by blocking direct contact between the transparent conducting oxide and the perovskite layer. So far, highly performing perovskite solar cells have been achieved using a blocking layer that requires sintering at high temperatures ( >  450 °C). In this study, reactive magnetron sputtering was used to synthesise crystalline anatase TiO 2 thin film blocking layer at a moderate temperature (150 °C). The influence of block layer thickness on the photovoltaic performance is scrutinised. A high performance of 8.7% power conversion efficiency was obtained for perovskite solar cells with a 76 nm thick TiO 2 blocking layer. This low temperature synthesis method will extend the choice of substrate to cheap and flexible polymer substrates. The surface plasma treatment prior to the blocking layer deposition was also found to affect the performance of the solar cells.

History

Journal

Thin solid films

Volume

636

Pagination

307 - 313

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0040-6090

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, Elsevier B.V.