Quinoidal 2,2′,6,6′-Tetraphenyl-Dipyranylidene as a Dopant-Free Hole-Transport Material for Stable and Cost-Effective Perovskite Solar Cells

Abstract : We report on the use of 2,2′,6,6′-tetraphenyldipyranylidene (DIPO-Ph4), a large quinoidal planar π-conjugated heterocycle, as a simple, easy-to-synthetize, and efficient dopant-free hole-transport material in perovskite solar cells (PSCs). PSCs using pristine DIPO-Ph4 show photon conversion efficiencies up to 10.1 %, which is higher than a PSC utilizing dopant-free spiro-OMeTAD (5.1 %). DIPO-Ph4-based PSCs exhibit a short-circuit current density of 19.52 mA cm−2 and an open-circuit voltage of 0.933 V, values that are superior to dopant-free spiro-OMeTAD and comparable to doped spiro-OMeTAD. These better performances find their origin in a higher HOMO level (−4.74 eV) and a much higher hole mobility (2×10−2 cm2 V−1 s−1). Finally, PSCs based on DIPO-Ph4 possess a superior stability compared to doped-spiro-OMeTAD-based devices when tested over 600 h.
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Energy Technology, 2017, Perovskite Optoelectronics, 5 (10), pp.1852-1858. 〈10.1002/ente.201700448〉
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Chao Shen, Marc Courté, Anurag Krishna, Shasha Tang, Denis Fichou. Quinoidal 2,2′,6,6′-Tetraphenyl-Dipyranylidene as a Dopant-Free Hole-Transport Material for Stable and Cost-Effective Perovskite Solar Cells. Energy Technology, 2017, Perovskite Optoelectronics, 5 (10), pp.1852-1858. 〈10.1002/ente.201700448〉. 〈hal-01629640〉

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