Improved Performance of Printable Perovskite Solar Cells with Bifunctional Conjugated Organic Molecule

Abstract

A bifunctional conjugated organic molecule 4-(aminomethyl) benzoic acid hydroiodide (AB) is designed and employed as an organic cation in organic–inorganic halide perovskite materials. Compared with the monofunctional cation benzylamine hydroiodide (BA) and the nonconjugated bifunctional organic molecule 5-ammonium valeric acid, devices based on AB-MAPbI₃ show a good stability and a superior power conversion efficiency of 15.6% with a short-circuit current of 23.4 mA cm⁻², an open-circuit voltage of 0.94 V, and a fill factor of 0.71. The bifunctional conjugated cation not only benefits the growth of perovskite crystals in the mesoporous network, but also facilitates the charge transport. This investigation helps explore new approaches to rational design of novel organic cations for perovskite materials.

A bifunctional conjugated organic molecule AB is designed and employed as an organic cation in perovskite materials. Compared with the monofunctional cation BA and the nonconjugated bifunctional cation AVA, the devices based on AB-MAPbI₃ show superior efficiency with good stability. The bifunctional-conjugated cation not only benefits the growth of perovskite crystals in the mesoporous network, but also facilitates the charge transport.

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