Graphene-based hole transport material for perovskite solar cells

Hong Lin^a, Ye Zhang^a, Qiang Luo^a

^aTsinghua University, Yifu Building Room 2422, Tsinghua University,Haidian District, Beijing, 100084, China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Qiang Luo, presentation 115
Publication date: 5th February 2015

The recently well-developed perovskite solar cells are of particular interest because they can offer a number of advantages when compared to existing photovoltaic technologies. Searching for low cost, suitable alternatives to replace the present components in perovskite solar cells are of vital importance for their further cost reduction and large-scale implementation. Carbon nanomaterials exhibit remarkable electrical property, suitableenergy levels and high mobility that enable exciting applications in perovskite solar cells. Herein, the utilisation of carbon nanomaterials such as carbon nanotubes or graphene as hole transport material or hole collector in perovskite solar cells are presented. Normal perovskite solar cells based on CH₃NH₃PbI₃ as absorber and graphene-based carbon material as hole collector, achieve power conversion efficiency of over 9%. The charge transfer between graphene-based nanomaterial and the perovskite was investigated using photoluminescence spectra, obvious photoluminescence quenching was observed when perovskite interfaced with graphene material. Conductivity measurement and impedance spectroscopy results show that conductivity of the graphene-based hole transport material influences the photovoltaic performance of the perovskite solar cells.

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