Excellent Moisture Stability and Efficiency of Inverted All-Inorganic CsPbIBr₂ Perovskite Solar Cells through Molecule Interface Engineering

Abstract

All-inorganic lead halide perovskite solar cells (PSCs) have drawn widespread interest because of its excellent thermal stability compared to its organic–inorganic hybrid counterpart. Poor phase stability caused by moisture, however, has thus far limited their commercial application. Herein, by modifying the interface between the hole-transport layer (HTL) and the perovskite light absorption layer, and by optimizing the HTL for better energy alignment, we controlled the growth of perovskite, reduced carrier recombination, facilitated carrier injection and transport, and improved the PSC’s power conversion efficiency (PCE) and moisture stability. When testing using a positive bias scan, we obtained a significant improvement in PCE, 9.49%, which is the champion efficiency of CsPbIBr2-based inverted PSC at present. The stability measurement shows that the passivated CsPbIBr2-based inverted PSCs can retain 86% of its initial efficiency after 1000 h preserved in ambient air with 65% relative humidity. This study paves a new way for enhancing the moisture stability and power conversion efficiency of CsPbIBr2-based PSCs.

Enhanced Light Absorption by Facile Patterning of Nano-grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

“…Three dominant diffraction peaks at 15.02°, 21.27°, and 30.15° that are indexed to the (100), (110), and (200) planes, respectively show the good crystallinity and morphology formation in the CsPbIBr 2 perovskite layer, which are further con rmed from the SEM image in the inset of Fig. 2(c) [20,[28][29][30]. Table 1 show the J-V characteristics for the devices with and without 1D GNP pattern under AM 1.5G illumination (100 mW/cm 2 ).…”

Enhanced Light Absorption by Facile Patterning of Nano-Grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

“…The typical diffraction peaks in the XRD patterns were matched to α-phase CsPbIBr 2 and were found to be consistent with those in previous reports. The three dominant diffraction peaks at 15.02°, 21.27°, and 30.15° that are indexed to the (100), (110), and (200) planes, respectively, show good crystallinity and morphology of the CsPbIBr 2 perovskite layer, which are further confirmed by the SEM image in the inset of Figure 2 c [ 20 , 29 , 30 , 31 ]. We can also see the XRD peak at 25.2° from the (101) plane of the anatase TiO 2 structure, as we used a TiO 2 nanoparticle solution (crystal structure: anatase; average size: 50 nm) to fabricate an mp-TiO 2 layer.…”

Efficient and Stable All‐Inorganic Perovskite Solar Cells

“…[92] Enormous efforts have been made to optimize the PCE of CsPbIBr 2 -based devices. [93][94][95][96][97] To overcome interfacial nonradiative recombination, ETL/CsPbIBr 2 interface modification was implemented by inserting a SmBr 3 interfacial layer. It was demonstrated that improved crystallization and morphology of perovskite films were realized after interface modification.…”