Enhanced Efficiency and Stability of All‐Inorganic CsPbI₂Br Perovskite Solar Cells by Organic and Ionic Mixed Passivation

Abstract

All-inorganic perovskites have been intensively investigated as potential optoelectronic materials because of their excellent thermal stability, especially for CsPbI 2 Br. Herein, the authors studied the effects of mixed passivation utilizing organic phenylethylammonium bromide and inorganic ionic cesium bromide (PEABr + CsBr) on the all-inorganic perovskite (CsPbI 2 Br) solar cells for the first time. The treatment with different passivation mechanisms enhances the perovskite film quality, resulting in uniform surface morphology and compact film with low trap density. Besides, the passivation improves the energy level alignment, which benefits the hole extraction at the perovskite/HTL interface and drives the interface electron separation, suppressing the charge recombination and realizing a high open-circuit voltage (V oc ). Finally, the device represents a high power conversion efficiency (PCE) of 16.70%, a V oc of 1.30 V, and an excellent fill factor (FF) of 0.82. The V oc loss and high FF should be among the best values for CsPbI 2 Br based devices. Furthermore, the treated devices exhibit remarkable long-term stability with only 8% PCE loss after storing in a glove box for more than 1000 h without encapsulation.

Reveal the Humidity Effect on the Phase Pure CsPbBr3 Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector

“…The application of lead halide perovskites in the field of optoelectronics has attracted extensive research interest in recent years. As a new semiconductor photoelectric conversion material, it has plenty of advantages, such as high light absorption coefficient, [1,2] long carrier lifetime, [3][4][5][6] low defect state density [5] and high carrier mobility, [3,7] etc. Perovskite single crystals can be prepared by the low-temperature solution method.…”

Intermediate Phase‐Assisted Sequential Deposition Toward 15.24%‐Efficiency Carbon‐Electrode Cspbi2br Perovskite Solar Cells

“…We attribute such a disagreement to the fact that the excess CsBr species in CsPbI 2 Br film are mainly distributed at the grain boundaries. In this case, CsBr species can effectively passivate the defects located at grain boundaries, [ 28 ] thus weakening the accumulation of charged defects and decreasing the surface potential.…”

Dithiol surface treatment towards improved charge transfer dynamic and reduced lead leakage in lead halide perovskite solar cells

“…High light absorption, facilely tuned band gap, long diffusion length of charge carriers, low cost and simple fabrication process are always contributing to the versatile application of perovskite materials 1–8 . PSCs, as promising photovoltaic devices, have been continuously attractive to plenty of researchers in recent years 9–13 . Typical Pb‐based perovskite materials have always been a double‐edged sword.…”

“…[1][2][3][4][5][6][7][8] PSCs, as promising photovoltaic devices, have been continuously attractive to plenty of researchers in recent years. [9][10][11][12][13] Typical Pbbased perovskite materials have always been a doubleedged sword. On one hand, a power conversion efficiency (PCE) over 25% has been realized in recent works, which has been comparable to the conventional silicon solar cells.…”