Search query: MAPbCl3

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abstract: Hybrid perovskite MAPbCl3 is considered to be one of the most promising candidates applied in visible blind UV photo detectors due to its outstanding optoelectronic properties. It is proved that the MAPbCl3 single crystal is more excellent than its polycrystalline counterpart because of its fewer defects and grain boundaries. When referring to a single crystal, the crystal orientation or crystal structure anisotropy is an inevitable topic, because structure anisotropy can affect or decide the optoelectronic properties of single crystals. In this study, both cubic and triangular prism MAPbCl3 single crystals with (100) and (110) crystallographic planes were successfully grown from mixed solutions. The crystal growth process, crystal structure and optical absorption were investigated. Moreover, by fabricating metal semiconductor metal (MSM) photo detectors using Au interdigital electrodes on both (100) and (110) planes, the optoelectronic anisotropy was explored by comparing photocurrents, responsivity, external quantum efficiency and detectivity. According to the crystal structure and calculated charge density, the optoelectronic anisotropy in the MAPbCl3 single crystal was revealed.
author_names: Xiaohua Cheng

Lin Jing

Yingge Zhao

Songjie Du

Jianxu Ding

Tian-liang Zhou
title: Crystal orientation dependent optoelectronic properties of MAPbCl3 single crystals
year: 2018

abstract: As one type of organic inorganic hybrid lead halide perovskites, MAPbX3 has attracted immense interests in applications of optoelectronic devices because of its remarkable properties. However, the
author_names: Xiaohua H Cheng

Lin Jing

Ye Yuan

Songjie Du

Jun Zhang

Xiaoyuan Zhan

Jianxu Ding

Hao Yu

Guodong Shi
title: Fe2+/Fe3+ Doped into MAPbCl3 Single Crystal: Impact on Crystal Growth and Optical and Photoelectronic Properties
year: 2019

abstract: Since their first appearance, organic inorganic perovskite absorbers have been capturing the attention of the scientific community. While high efficiency devices highlight the importance of band level alignment, very little is known on the origin of the strong n doping character observed in the perovskite. Here, by means of a highly accurate photoemission study, we shed light on the energy alignment in perovskite based devices. Our results suggest that the interaction with the substrate may be the driver for the observed doping in the perovskite samples.
author_names: Marco Caputo

N Cefarin

Andrea Radivo

Nicola Demitri

Lara Gigli

Jasper Rikkert Plaisier

Mirco Panighel

Giovanni Di Santo

Sacha Moretti

Angelo Giglia

Maurizio Polentarutti

Filippo De Angelis

Edoardo Mosconi

Paolo Umari

Massimo Tormen

Andrea Goldoni
title: Electronic structure of MAPbI3 and MAPbCl3: importance of band alignment
venue: Scientific Reports
year: 2019

abstract: The local structure of MAPbCl3 has been investigated through the combined use of X ray and neutron pair distribution function (PDF) analysis and computational modeling. The results indicate the presence of a significant level of distortion at the short range, irrespective of the average structure found by diffraction, and this suggests a possible correlation between the type of distortion and the features of the strongest H X bond. The distortion of the octahedra decreases by reducing temperature, but the overall tilting of the octahedral system increases, and such tilting depends on the size of the anion. The comparison of the short range structural data available on the MAPbX3 family strongly indicates a common pattern of the local structural distortion in these systems.
author_names: Andrea Bernasconi

Katharine L Page

Zhenbang Dai

Liang Z Tan

Andrew M Rappe

Lorenzo Malavasi
title: Ubiquitous Short Range Distortion of Hybrid Perovskites and Hydrogen Bonding Role: the MAPbCl3 Case
year: 2018

abstract: Various methods have been developed to optimize the active layer of perovskite solar cells. To date, the introduction of excess PbI2 and chlorine doping are two typical means. Herein, an ion exchange decomposition process was designed to combine these two approaches. In this process, the I Cl exchange and MACl sublimation occurred simultaneously at elevated temperature, resulting in a PbI2 excess, Cl doped perovskite film. This combined strategy could guarantee that as much chlorine as possible was doped into the perovskite crystal lattice, which enables the production of perovskite films with obviously reduced defect density and enhanced carrier diffusion length. Strikingly, the power conversion efficiency of the device is boosted from 17.17% to 20.15%
author_names: Cui Ping Zhang

Zhipeng Li

Juan Liu

Yunchuan Xin

Zhipeng Shao

Guanglei Cui

Shuping Pang
title: MAPbCl3 Mediated Decomposition Process to Tune Cl/PbI2 Distribution in MAPbI3 Films
year: 2018

abstract: Recently, perovskite based solar cells have attracted lots of research interest, some of which is in the passivation of perovskite surfaces, particularly the heterojunction based surface passivation. In this study, the optical dynamics of MAPbBr3 single crystals with and without heterojunction passivation were studied systematically by means of a time resolved spectroscopic technique for the first time. The emission lifetime of MAPbBr3 single crystals under two photon (1064 nm) excitation is a few orders of magnitude longer than that measured under one photon (355 nm or 532 nm) excitation. Interestingly, with surface passivation, the lifetime measured at 355 nm excitations could be tuned significantly, whereas the lifetime change under 1064 nm excitations was considerably less. Our results give a direct evidence of surface quench by comparing the lifetimes before and after surface passivation. Furthermore, the results demonstrate that proper MAPbCl3 MAPbBr3 heterojunctions can dramatically reduce the recombination channels in the surface region, which can be potentially useful for perovskite based solar cells, light emitting diodes (LED) and sensitive detectors.
author_names: Haizhou Lu

Huotian Zhang

Sijian Yuan

Jiao Wang

Yiqiang Zhan

Lirong Zheng
title: An optical dynamic study of MAPbBr3 single crystals passivated with MAPbCl3/I3 MAPbBr3 heterojunctions.
venue: Physical chemistry chemical physics PCCP
year: 2017

author_names: Lu Haizhou

Zhang Huotian

Yuan Sijian

Wang Jiao

Zhang Yiqiang

Zheng Li-rong
title: MAPbCl3/I3 MAPbBr3heteroJie He deBu Dong Tai Hua shitaMAPbBr3Dan Jie Jing noGuang Dong Li Xue Yan Jiu
year: 2017

abstract: Hybrid organic inorganic lead halide perovskites are projected as new generation photovoltaic and optoelectronic materials with improved efficiencies. However, their electronic structure so far remains poorly understood, particularly in the orientationally disordered cubic phase. We performed electronic structure investigations using angle resolved photoemission spectroscopy on two prototypical samples (MAPbBr3 and MAPbCl3) in their cubic phase and the results are compared with the calculations within two theoretical models where MA+ is orientationally (1) disordered (MA+ ion is replaced by spherically symmetric Cs+ ion) and (2) ordered (MA oriented along (100) direction) but keeping the symmetry of the unit cell cubic. Degeneracy of the valence bands and behavior of constant energy contours are consistent with Model (1) which supports strongly the disordered nature of the orientation of the MA+ ions in the cubic phase. Band structure calculations also reveals that spin orbit coupling induced Rashba splitting is suppressed by the orientational disorder.
author_names: Pronoy Nandi

Chandan Giri

Vijay Singh

Luca Petaccia

Unnikrishnan Manju

Subhendra D Mahanti

Dinesh Topwal
title: Probing the Electronic Structure of Hybrid Perovskites in the Orientationally Disordered Cubic Phase.
venue: The journal of physical chemistry letters
year: 2020

abstract: Introducing hole/electron transporting and blocking layers is considered to enhance the performance of electronic devices based on organic inorganic hybrid halide perovskite single crystals (PSCs) In many photodiodes, the hole/electron transporting or blocking materials are spin coated or thermal evaporated on PSC to fabricate heterojunctions. However, the heterojunction interfaces due to lattice mismatch between hole/electron, transporting or blocking materials and perovskites easily form traps and cracks, which cause noise and leakage current. Besides, these low mobility transporting layers increase the difficulty of transporting carriers generated by photons to the electrode; hence, they also increase the response time for photo detection. In the present study, MAPbCl3 MAPbBr2.5Cl0.5 heterojunction interfaces were realized by liquid phase epitaxy, in which MAPbBr2.5Cl0.5 PSC acts as an active layer and MAPbCl3 PSC acts as a hole blocking layer (HBL) Our PIN photodiodes with epitaxial MAPbCl3 PSC as HBL show better performance in dark current, light responsivity, stability, and response time than the photodiodes with spin coated organic PCBM as HBL. These results suggest that the heterojunction interface formed between two bulk PSCs with different halide compositions by epitaxy growth is very useful for effectively blocking the injected charges under high external electric field, which could improve the collection of photo generated carriers and hereby enhance the detection performance of the photodiode. Furthermore, the PIN photodiodes made of PSC with epitaxial HBL show the sensitivities of 7.08 mC Gyair 1 cm 2, 4.04 mC Gyair 1 cm 2, and 2.38 mC Gyair 1 cm 2 for 40 keV, 60 keV, and 80 keV X ray, respectively.
author_names: Yuzhu Pan

Xuefeng Wang

Yubing Xu

Yuwei Li

Elias Emeka Elemike

Ahmed Shuja

Qing Li

Xiaobing Zhang

Junli Chen

Zhiwei Zhao

Wei Lei
title: Enhanced Performance of Perovskite Single Crystal Photodiodes by Epitaxial Hole Blocking Layer
venue: Frontiers in Chemistry
year: 2020

abstract: Mixed halide perovskite (MAPbI3 xClx) solar cells have been widely researched because of their excellent photoelectronic properties. However, Cl doping is difficult to obtain due to the low formation energy and low boiling point of MAPbCl3 which can decompose into PbCl2 and MACl. MACl can leave the perovskite film during the annealing process leading to the loss of Cl and undesirable pinholes or cracks. Here, we present the chloroformamidinium chloride (Cl FACl) as a "stabilizer" to stabilize Cl ions and thus restrain the removal of Cl avoiding the undesirable defects. With the introduction of Cl FACl, improvement of film quality and reduction of defects result in a longer TRPL decay time and thus more stable devices. High efficiency methylammonium lead trihalide (MAPbI3 xClx) perovskite solar cells with an efficiency up to 20.36% have been achieved with negligible hysteresis.
author_names: Yulei Wu

Xiao-Da Li

Sheng Fu

Li Wan

Junfeng Fang
title: Efficient methylammonium lead trihalide perovskite solar cells with chloroformamidinium chloride (Cl FACl) as an additive
year: 2019