Improvement of the photovoltaic parameters of perovskite solar cells using a reduced-graphene-oxide-modified titania layer and soluble copper phthalocyanine as a hole transporter

Esmaiel Nouri, Mohammad Reza Mohammadi (Lead / Corresponding author), Zong Xiang Xu, Vassilios Dracopoulos, Panagiotis Lianos (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    Functional perovskite solar cells can be made by using a simple, inexpensive and stable soluble tetra-n-butyl-substituted copper phthalocyanine (CuBuPc) as a hole transporter. In the present study, TiO2/reduced graphene oxide (T/RGO) hybrids were synthesized via an in situ solvothermal process and used as electron acceptor/transport mediators in mesoscopic perovskite solar cells based on soluble CuBuPc as a hole transporter and on graphene oxide (GO) as a buffer layer. The impact of the RGO content on the optoelectronic properties of T/RGO hybrids and on the solar cell performance was studied, suggesting improved electron transport characteristics and photovoltaic parameters. An enhanced electron lifetime and recombination resistance led to an increase in the short circuit current density, open circuit voltage and fill factor. The device based on a T/RGO mesoporous layer with an optimal RGO content of 0.2 wt% showed 22% higher photoconversion efficiency and higher stability compared with pristine TiO2-based devices.

    Original languageEnglish
    Pages (from-to)2388-2395
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume20
    Issue number4
    Early online date20 Dec 2017
    DOIs
    Publication statusPublished - 28 Jan 2018

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