Improved Stability of β-CsPbI3 Inorganic Perovskite by π-Conjugated Bifunctional Surface Capped Organic Cations for High Performance Photovoltaics

Multiple-ring naphthalenediammonium is employed for the first time to overcome the intrinsic instability of β-CsPbI3 perovskite via anchoring the ammonium groups occupying A-site vacancies. It improves charge transport and moisture stability giving out a champion power conversion efficiency of 16.69% for an excellent inorganic perovskite solar cell.