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Enhanced Performance of Perovskite Solar Cells by luminescent Small Molecule DBP: Perovskite Absorption Spectrum Modication and Interface Engineering

Abstract

The interfacial defect states between active layer and charge transport layer in perovskite solar cells (PSCs) are one of main channels of energy-loss, which results in carrier recombination loss and then limits efficiency and stability of device. In this work, a luminescent organic small molecule material tetraphenyldibenzoperiflanthene (DBP) is inserted between CH3NH3PbI3 perovskite and electron transport layer PCBM as an interface modication layer. As a result, DBP-based PSCs attained an average power conversion efficiency (PCE) of 15.61%, obviously higher than 14.26% of the reference device. The enhanced PCE is attributed to the multifunctional synergistic effect of DBP. DBP not only behaves an efficient interface modification layer to passivate perovskite defect and improve energy level alignment and thus reduce carrier recombination loss at the interface, but also play a CH3NH3PbI3 absorption spectrum modification layer by FÖster energy transfer and thus enhance the light absorption of CH3NH3PbI3 layer in near-infrared region. In the meantime, the hydrophobic and passivation effect of DBP improve the air-, thermal- and photo-stability of PSCs. This work demonstrated that the multifunctional organic luminescent molecules as an interfacial engineering material is highly useful and facile method for improving the performance of planar perovskite solar cells.

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Publication details

The article was received on 05 Jan 2019, accepted on 08 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00064J
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Enhanced Performance of Perovskite Solar Cells by luminescent Small Molecule DBP: Perovskite Absorption Spectrum Modication and Interface Engineering

    S. Ding, S. Li, Q. Sun, Y. Wu, Y. Liu, Z. Li, Y. Cui, H. Wang, Y. Hao and Y. Wu, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC00064J

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