Electroluminescent Solar Cells Based on CsPbI3 Perovskite Quantum Dots

All-inorganic CsPbX3 (X = Cl, Br, I, or mixed halides) perovskite quantum dots (QDs) exhibit tunable optical bandgaps and narrow emission peaks, which have received worldwide interest in the field of both photovoltaics (PVs) and light-emitting diodes (LEDs). Herein, it is reported a discovery that CsPbI3 perovskite QD solar cell can simultaneously deliver high PV performance and intense electroluminescence. In specific, the multifunctional CsPbI3 QD film is fabricated through a simple yet efficient solid-state-ligand exchange process using a tailored organic ligand triphenyl phosphite (TPPI). The function of QD surface manipulation using TPPI here is proven to be twofold, balancing the carrier transport and effectively passivating the QD surface to produce conductive and emissive QD film. The CsPbI3 perovskite QD solar cell delivers a champion efficiency of 15.21% with improved open circuit voltage and high fill factor. Concurrently functioning as a red LED, the CsPbI3 perovskite QD solar cell outputs electric power to light conversion efficiency approaching 4%, a record value for QD electroluminescent PVs. The results here indicate that these versatile perovskite QDs may be a promising candidate for fabricating multifunctional optoelectronic devices.

Automated summary

All-inorganic CsPbX3 perovskite quantum dots with tunable optical bandgaps and narrow emission peaks have attracted interest in the fields of photovoltaics and light-emitting diodes. The CsPbI3 perovskite QD solar cell, fabricated through a solid-state-ligand exchange process, demonstrates high PV performance and intense electroluminescence. This multifunctional approach using CsPbI3 perovskite QDs shows promise for fabricating optoelectronic devices.