Highly Stable All‐Inorganic Perovskite Solar Cells Processed at Low Temperature

Abstract

All-inorganic perovskites such as cesium lead bromide (CsPbBr 3 ) can show much better stability than organic-inorganic hybrid perovskite materials in ambient air. However, fabricating a high-quality CsPbBr 3 perovskite film normally requires a high annealing temperature, leading to the difficulty of preparing CsPbBr 3 solar cells with low-temperature solution process. In this work, we demonstrated a pyridine-vapor treatment in two-step fabrication of CsPbBr 3 perovskite films that can reduce the annealing temperature to about 160 C. The mechanism is attributed to the reaction of pyridine with lead bromide, which forms an intermediate phase and leads to a low activation energy in the formation of CsPbBr 3 perovskite films during thermal annealing. The devices without encapsulation show excellent stability in ambient air with the humidity up to 70%. This work provides a novel approach for preparing inorganic perovskite solar cells at low temperature.

High‐Efficiency Solution‐Processed Two‐Terminal Hybrid Tandem Solar Cells Using Spectrally Matched Inorganic and Organic Photoactive Materials

“…However, a too‐wide bandgap (≈2.30 eV) has been unfavorable for a photoactive material in PSCs. [ 11,12 ] The cubic CsPbI 3 has a more suitable bandgap (≈1.73 eV). Nevertheless, the black cubic phase is stable only at a high temperature (>320 °C) and rapidly converts to the orthorhombic phase with a bandgap of ≈2.82 eV at RT under ambient conditions.…”

A Green Anti‐Solvent Process for High Performance Carbon‐Based CsPbI2Br All‐Inorganic Perovskite Solar Cell

“…Although rapid progress has been made in the development of inorganic perovskite absorber, there remain challenges waiting to be resolved to improve the device performance. CsPbBr 3 has a relatively wide band gap of 2.3 eV, which does not lie in the ideal energy ranges as a sunlight absorber . CsPbI 3 has a more desirable band gap of 1.73 eV.…”

Suppressed Decomposition of Perovskite Film on ZnO Via a Self‐Assembly Monolayer of Methoxysilane

“…A solar cell is a device that converts solar energy into electric energy. Since the first report of using organic–inorganic hybrid perovskite as the light harvester of solar cells, perovskite solar cells (PSCs) including inorganic PSCs have attracted worldwide attention due to their excellent photovoltaic performance and low‐cost manufacture . And the latest certified highest power conversion efficiency (PCE) of PSCs has exceeded 23%…”

“…Since the first report of using organic-inorganic hybrid perovskite as the light harvester of solar cells, perovskite solar cells (PSCs) including inorganic PSCs have attracted worldwide attention due to their excellent photovoltaic performance and low-cost manufacture. [1][2][3][4] And the latest certified highest power conversion efficiency (PCE) of PSCs has exceeded 23%. [5] The conventional-structure of PSCs contains transparent conductive oxide (TCO), electron transport layer (ETL), light harvester, hole transport layer (HTL), and metal electrode.…”