Blue-Green Color Tunable Solution Processable Organolead Chloride–Bromide Mixed Halide Perovskites for Optoelectronic Applications

Abstract

Solution-processed organo-lead halide perovskites are produced with sharp, color-pure electroluminescence that can be tuned from blue to green region of visible spectrum (425–570 nm). This was accomplished by controlling the halide composition of CH3NH3Pb(BrxCl1–x)3 [0 ≤ x ≤ 1] perovskites. The bandgap and lattice parameters change monotonically with composition. The films possess remarkably sharp band edges and a clean bandgap, with a single optically active phase. These chloride–bromide perovskites can potentially be used in optoelectronic devices like solar cells and light emitting diodes (LEDs). Here we demonstrate high color-purity, tunable LEDs with narrow emission full width at half maxima (FWHM) and low turn on voltages using thin-films of these perovskite materials, including a blue CH3NH3PbCl3 perovskite LED with a narrow emission FWHM of 5 nm.

High Open‐Circuit Voltages in Tin‐Rich Low‐Bandgap Perovskite‐Based Planar Heterojunction Photovoltaics

“…[1][2][3][4][5] This remarkable result, coupled with their low cost, tunability, and versatile lowtemperature preparation methods, makes hybrid perovskites one of the most promising semiconductor classes not just for solar energy harvesting, but also for light emitting diodes (LEDs), field effect transistors (FETs), and lasers. [6][7][8][9][10][11][12] 3D organometallic halide perovskites such as those studied here adopt the classic perovskite structure ABX 3 , where A represents the organic cation like methylammonium (MA); B the divalent metal ion like lead (Pb 2+ ), tin (Sn − ). [12][13][14][15][16][17] The vast majority of research conducted in this area has focused on "first generation" MAPbX 3 -based perovskites, [8,18] mainly due to the excellent tunability of their optoelectronic properties.…”

“…[6][7][8][9][10][11][12] 3D organometallic halide perovskites such as those studied here adopt the classic perovskite structure ABX 3 , where A represents the organic cation like methylammonium (MA); B the divalent metal ion like lead (Pb 2+ ), tin (Sn − ). [12][13][14][15][16][17] The vast majority of research conducted in this area has focused on "first generation" MAPbX 3 -based perovskites, [8,18] mainly due to the excellent tunability of their optoelectronic properties. [18,19] Characteristics such as high mobility, [20,21] high bimolecular recombination rate for charge carriers, [10] and low exciton binding energy [22][23][24] have resulted in the demonstration of high-performance films and devices for PV, LED, [9,12,[25][26][27] FET, [21] and lasing applications.…”

“…[12][13][14][15][16][17] The vast majority of research conducted in this area has focused on "first generation" MAPbX 3 -based perovskites, [8,18] mainly due to the excellent tunability of their optoelectronic properties. [18,19] Characteristics such as high mobility, [20,21] high bimolecular recombination rate for charge carriers, [10] and low exciton binding energy [22][23][24] have resulted in the demonstration of high-performance films and devices for PV, LED, [9,12,[25][26][27] FET, [21] and lasing applications. [10,28] One potential drawback of the MAPbX 3 semiconductor family, however, is its relatively wide bandgap (3.2-1.6 eV), which dramatically limits its sensitivity in the near-IR (NIR) to mid-IR region of the solar spectrum.…”

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

“…This unprecedented combination has led to photovoltaic devices that can be processed at room temperature and achieve performance levels similar to industry giant polycrystalline silicon, from a starting point of 3.8% in 2009. [1][2][3][4] The first light-emitting electrochemical cells [5] and diodes [6][7][8] have also been introduced recently, leading to tunable light emission spectra and internal quantum efficiencies exceeding 15%.The road towards these achievements has been marked by a constant improvement of perovskite deposition techniques fueled by our increasing understanding of the crystallization processes. The choice of deposition technique, either from solution or vapor, and the composition and order in which precursor species are applied has a great influence on the crystallization kinetics.…”

“…This unprecedented combination has led to photovoltaic devices that can be processed at room temperature and achieve performance levels similar to industry giant polycrystalline silicon, from a starting point of 3.8% in 2009. [1][2][3][4] The first light-emitting electrochemical cells [5] and diodes [6][7][8] have also been introduced recently, leading to tunable light emission spectra and internal quantum efficiencies exceeding 15%.…”