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Impedance Investigation of the Highly Efficient Polymer Solar Cells with Composite CuBr2/MoO3 Hole Transport Layer

Abstract

Developing air-stability, low cost, non-toxicity, and high transparency charge buffer layer is a critical strategy to achieve the high photoelectric conversion efficiency of polymer photovoltaic cells. This paper reports the remarkable improvement of device performance by employing a combination of Copper bromide (CuBr2) and molybdenum trioxide (MoO3) (CuBr2/MoO3) as the hole transport layer (HTL) of inverted-type polymer solar cells (PSCs). The bulk transport processes and resistive capacitance elements in the operating PTB7:PC71BM bulk hetero-junction PSCs were characterized using the impedance spectroscopy. The impedance response was modeled using two equivalent circuital models, which are the general transmission line circuit (GTLC) model and electrochemical polarization model. The effective carrier lifetime, conductivity, and mobility for both devices were extracted from the models. The improved hole injection and transport at the anode and the efficient electron transport blocking decreased interface recombination and contact resistances, resulting in an improved power conversion efficiency (PCE) from 7.30 % to 9.56 %. These results suggest the quantitative interpretation and modeling of the impedance spectroscopy provide an effective way to unravel the operating mechanism of photovoltaic devices.

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Publication details

The article was received on 28 May 2017, accepted on 14 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP03595K
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Impedance Investigation of the Highly Efficient Polymer Solar Cells with Composite CuBr2/MoO3 Hole Transport Layer

    Z. Li, W. Guo, C. Liu, X. Zhang, S. Li, J. Guo and L. Zhang, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP03595K

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