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Electronic structure and effective mass of pristine and Cl-doped CsPbBr_(3)
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作者 魏志远 魏愉昊 +7 位作者 徐申东 彭舒婷 Makoto Hashimoto 潘旭 匡泯泉 肖正国 何俊峰 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第5期167-171,共5页
Organic–inorganic lead halide perovskites(LHPs) have attracted great interest owing to their outstanding optoelectronic properties.Typically,the underlying electronic structure would determinate the physical properti... Organic–inorganic lead halide perovskites(LHPs) have attracted great interest owing to their outstanding optoelectronic properties.Typically,the underlying electronic structure would determinate the physical properties of materials.But as for now,limited studies have been done to reveal the underlying electronic structure of this material system,comparing to the huge amount of investigations on the material synthesis.The effective mass of the valance band is one of the most important physical parameters which plays a dominant role in charge transport and photovoltaic phenomena.In pristine CsPbBr_(3),the Fr?hlich polarons associated with the Pb–Br stretching modes are proposed to be responsible for the effective mass renormalization.In this regard,it would be very interesting to explore the electronic structure in doped LHPs.Here,we report high-resolution angle-resolved photoemission spectroscopy(ARPES) studies on both pristine and Cl-doped CsPbBr_(3).The experimental band dispersions are extracted from ARPES spectra along both ■ and ■ high symmetry directions.DFT calculations are performed and directly compared with the ARPES data.Our results have revealed the band structure of Cl-doped CsPbBr_(3) for the first time,which have also unveiled the effective mass renormalization in the Cl-doped CsPbBr_(3) compound.Doping dependent measurements indicate that the chlorine doping could moderately tune the renormalization strength.These results will help understand the physical properties of LHPs as a function of doping. 展开更多
关键词 lead halide perovskites electronic structure effective mass
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影响TiMn_x非计量比合金储氢容量的结构因素 被引量:1
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作者 徐申东 方亮 丁晓丽 《物理化学学报》 SCIE CAS CSCD 北大核心 2016年第3期780-786,共7页
以TiMn_x(x=1.4,1.5,1.6,1.7)非计量比合金为对象,系统研究了储氢容量与其内在结构之间的相关性。结果表明,所有合金的主相均为C14型Laves相,但其储氢容量却存在显著差异。其中TiMn_(1.4)合金的储氢量约为0.65%(w,质量分数),吸/放氢平... 以TiMn_x(x=1.4,1.5,1.6,1.7)非计量比合金为对象,系统研究了储氢容量与其内在结构之间的相关性。结果表明,所有合金的主相均为C14型Laves相,但其储氢容量却存在显著差异。其中TiMn_(1.4)合金的储氢量约为0.65%(w,质量分数),吸/放氢平台较倾斜,且存在明显的滞后;而TiMn_(1.5)合金的可逆储氢量达到1.2%(w),平台较为平坦;但继续增加x,其储氢量反而降低,如x=1.6合金的储氢量仅为0.30%(w),而x=1.7合金则几乎不吸氢。进一步结构解析表明,上述储氢容量的迥异主要归因于部分Ti原子占据Mn(2a)位置,且其占位率随x的增加而降低,随之C14相中贮氢四面体间隙体积减小;而引起贮氢四面体间隙体积发生变化的主要因素是Ti―Ti键和Mn(2a)―Mn(2a)键的键长,其中Mn(2a)―Mn(2a)键长的增加对合金储氢容量的提升起关键作用。 展开更多
关键词 储氢合金 LAVES相 四面体间隙 非化学计量比 原子占位
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