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Copolymers of Poly(3-thiophene acetic acid) with Poly(3-hexyl thiophene) as Hole Transporting Material for Interfacially Engineered Perovskite Solar Cell by Modulating Band Positions for Higher Efficiency

Abstract

In order to tune the band positions of hole transporting material (HTM) in the interfacially engineered perovskite solar cell (PSC) random copolymers of poly(3-thiophene acetic acid) and poly(3-hexyl thiophene) (P3TAA-co-P3HT) of different compositions are produced by oxidative polymerization. The copolymers are characterized using 1H NMR, FTIR, UV-Vis and gel permeation chromatography. Here ZnO nanoparticles are used as electron transporting material (ETM) and methyl ammonium lead iodide (MAPbI3) perovskite is used as light absorbing material forming the device FTO/ZnO/MAPbI3/copolymer/Ag where the power conversion efficiency (PCE) is found to be dependent on copolymer composition achieving a maximum (~10%) for 43 mol% P3TAA content in the copolymer (P3). The band gaps of the copolymers determined from UV-Vis and cyclic voltammetry exhibit a staggered gap hetero-interface configuration of which HOMO and LUMO of P3 match well with those of MAPbI3 causing highest PCE. Time-resolved photoluminescence spectra of MAPbI3/HTM samples indicates that faster charge transfer across the perovskite/copolymer interface with reduced recombination rate for P3 sample. The electrochemical impedance spectra (EIS) of the PSCs exhibit the Nyquist plots with two semicircles comprising with an equivalent circuit consisting of two parallel R-C and R-CPE circuits connected in series. Analysis of the data indicates highest effective electron lifetime value for the P3 copolymer, indicating lowest charge recombination than that of the components and other copolymers. The copolymers exhibit a stability intermediate of the components and amongst the copolymers P3 exhibits a maximum stability.

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Publication details

The article was received on 02 Mar 2018, accepted on 17 May 2018 and first published on 17 May 2018


Article type: Paper
DOI: 10.1039/C8CP01385C
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Copolymers of Poly(3-thiophene acetic acid) with Poly(3-hexyl thiophene) as Hole Transporting Material for Interfacially Engineered Perovskite Solar Cell by Modulating Band Positions for Higher Efficiency

    A. K. Nandi, A. Shit and P. Chal, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP01385C

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