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Exquisite Modulation of ZnO nanoparticles Electron Transporting Layer for High-Performance Fullerene-Free Organic Solar Cell with Inverted Structure

Abstract

Due to inverted organic solar cells have shown great advantages in achieving good stability, developing effective methods to increase power conversion efficiency shows great importance for practical applications. The demand of improving photovoltaic performance promotes exquisite modulations of all components in inverted devices including electron transporting layers. Here we developed an effective method of achieving systematic tuning on surface free energy of ZnO electron transporting layers with continuous gradation from 51.23 mN/m to 76.62 mN/m by mixing ZnO nanoparticles with PFN-Br. Based on the highly efficient bulk heterojunction system PBDB-TF:IT-4F, we achieved enhanced open circuit voltage (0.87 V), fill factor (78.79%) and power conversion efficiency (13.82%) in inverted device, which is benefitted from the optimized bulk heterojunction morphology on electron transporting layer with 63.89 mN/m surface free energy. Moreover, the optimized electron transporting layer shows much better stability than the control ZnO electron transporting layer due to the well-modified dispersity of nanoparticles. Our comprehensive analyses provide deep insights about the recombination/morphology control adjusted by the surface free energy of interfacial layers, which shall be the key factors that affect the device characteristics of inverted organic solar cells.

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Publication details

The article was received on 03 Dec 2018, accepted on 03 Jan 2019 and first published on 12 Jan 2019


Article type: Communication
DOI: 10.1039/C8TA11624E
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    Exquisite Modulation of ZnO nanoparticles Electron Transporting Layer for High-Performance Fullerene-Free Organic Solar Cell with Inverted Structure

    Z. Zheng, S. Zhang, J. Wang, J. Zhang, D. Zhang, Y. Zhang, Z. Wei, Z. Tang, J. Hou and H. Zhou, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11624E

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