Optical Properties of Perovskite‐Organic Multiple Quantum Wells

Abstract

A comprehensive study of the optical properties of CsPbBr 3 perovskite multiple quantum wells (MQW) with organic barrier layers is presented. Quantum confinement is observed by a blue-shift in absorption and emission spectra with decreasing well width and agrees well with simulations of the confinement energies. A large increase of emission intensity with thinner layers is observed, with a photoluminescence quantum yield up to 32 times higher than that of bulk layers. Amplified spontaneous emission (ASE) measurements show very low thresholds down to 7.3 μJ cm −2 for a perovskite thickness of 8.7 nm, significantly lower than previously observed for CsPbBr 3 thin-films. With their increased photoluminescence efficiency and low ASE thresholds, MQW structures with CsPbBr 3 are excellent candidates for high-efficiency perovskite-based LEDs and lasers.

Applications of vacuum vapor deposition for perovskite solar cells: A progress review

“…Under this condition, the individual evaporation rate of both precursors can be precisely controlled by QCMs, making it feasible to control the composition of the evaporated films. Vaynzof and her group doped phenylethylammonium iodide (PEAI) into the coevaporated CsPbI 3 perovskite films [27] . They found the microstructure and crystal orientation improved significantly after the addition of PEAI and achieved a PCE of 15%.…”

Perovskite Multiple Quantum Well Superlattices: Potentials and Challenges

“…Copyright 2021 American Chemical Society. Panel (f) is reprinted with permission under a Creative Commons CC-BY 4.0 License from ref . Published 2022 Wiley-VCH.…”

Evolution of Structure and Optoelectronic Properties During Halide Perovskite Vapor Deposition

“…Thus, vapor deposition is a perspective method, especially for multijunction or allperovskite tandem solar cells. 18,19 Since vapor deposition, requiring dedicated/specialized high-vacuum deposition chambers, is not an extensively utilized technique for perovskite fabrication, the majority of published work is focused on the specific deposition parameters and their influence on the perovskite layer quality. 11,12,20−22 The main cause is the nontrivial evaporation of the organic precursor, typically MAI, that has a low sticking coefficient influencing its adsorption onto the substrate.…”

“…Moreover, in view of the recent advances in high-efficiency perovskite/silicon tandem solar cells, , it provides a tool for precise codeposition of multiple layers without affecting the underlying substrate. Thus, vapor deposition is a perspective method, especially for multijunction or all-perovskite tandem solar cells. , …”