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Inverted Planar Solar Cells based on Perovskite/Graphene Oxide Hybrid Composites

Abstract

Mixing graphene oxide (GO) with CH3NH3PbI3 (PSK) in varied proportions (0.025, 0.05 and 0.075 mg mL-1) and using GO nanosheets as a p-type electrode for devices with a layer-by-layer thin-film configuration ITO/GO/PSK:GO/PCBM/Ag produced hybrid composite perovskite solar cells. The efficiency of power conversion (PCE) of the device prepared with GO in PSK solution (0.05 mg mL-1) attained 15.2 %, which is greater than a conventional planar heterojunction device (PCE 12.3 %) fabricated using pristine PSK. In the homogeneous PSK:GO active layers, PSK acted as a hole donor and GO as a hole acceptor. The optimum GO concentration (0.05 mg mL-1) produced increased charge mobility (investigated with Hall effect measurements), enhanced charge separation (investigated with photoluminescence decays) and retarded charge recombination (investigated with electrochemical impedance spectra), consistent with the trend of corresponding device performances. Our results thus indicate that the hybrid PSK:GO layer increased the interfacial contacts between the donor and acceptor of holes to balance the charge mobility and improved the photovoltaic performance with excellent reproducibility and stability.

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Publication details

The article was accepted on 15 Jun 2017 and first published on 15 Jun 2017


Article type: Communication
DOI: 10.1039/C7TA04575A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Inverted Planar Solar Cells based on Perovskite/Graphene Oxide Hybrid Composites

    C. Chung, S. Narra, E. Jokar, H. Wu and E. W. Diau, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04575A

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