Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications

作     者：Hong-Hua Fang Feng Wang Sampson Adjokatse Ni Zhao Jacky Even Maria Antonietta Loi 

作者机构：Photophysics&OptoElectronicsZernike Institute for Advanced MaterialsNijenborgh 4Groningen 9747 AGThe Netherlands Department of Electronic EngineeringThe Chinese University of Hong KongNew TerritoriesHong Kong UniversitéEuropéenne de BretagneINSAFOTONUMR 608235708 RennesFrance 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2015年第4卷第1期

页      面：1-7页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：The work in Groningen was partially supported by the European Research Council,ERC Starting Grant(No.306983)‘Hybrid solution processable materials for opto-electronic devices’(ERC-HySPOD) by the Foundation for Fundamental Research on Matter(FOM) which is part of the Netherlands Organization for Scientific Research(NWO),under the framework of the FOM Focus Group‘Next Generation Organic Photovoltaics’.J Even’s work is supported by the Fondation d’entreprises banque Populaire de l’Ouest under Grant PEROPHOT 2015.The technical support of A Kamp and J Kuiper is highly appreciated.We thank TTM Palstra for insightful discussions 

主　　题：formamidinium lead iodide low temperature perovskite photoluminescence triplet exciton 

摘      要：Formamidinium lead iodide(FAPbI3)is a newly developed hybrid perovskite that potentially can be used in high-efficiency solution-processed solar ***,the temperature-dependent dynamic optical properties of three types of FAPbI3 perovskite films(fabricated using three different precursor systems)are comparatively *** time-resolved photoluminescence(PL)spectra reveal that FAPbI3 films made from the new precursor(a mixture of formamidinium iodide and hydrogen lead triiodide)exhibit the longest lifetime of 439 ns at room temperature,suggesting a lower number of defects and lower non-radiative recombination losses compared with FAPbI3 obtained from the other two *** the temperature-dependent PL spectra,a phase transition in the films is clearly ***,exciton-binding energies of 8.1 and 18 meV for the high-and lowtemperature phases are extracted,***,the PL spectra for all of the samples show a single peak at room temperature,whereas at liquid-helium temperature the emission features two peaks:one in higher energy displaying a fast decay(0.5 ns)and a second red-shifted peak with a decay of up to several *** two emissions,separated by~18 meV,are attributed to free excitons and bound excitons with singlet and triplet characters,respectively.