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Quantum confinement effect of two-dimensional all-inorganic halide perovskites

Science China Materials 2017年第9期60卷 811-818页

作者：蔡波李晓明顾宇 Moussab Harb 李建海谢美秋曹菲宋继中张胜利 Luigi Cavallo 曾海波 MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics & NanomaterialsCollege of Materials Science and EngineeringNanjing University of Science and Technology King Abdullah University of Science and Technology (KAUST) KAUST Catalysis Center (KCC)Physical Sciences and Engineering Division (PSE)

Quantum confinement effect（QCE）, an essential physical phenomenon of semiconductors when the size becomes comparable to the exciton Bohr radius, typically results in quite different physical properties of low-dimensional materials from their bulk counterparts and can be exploited to enhance the device performance in various optoelectronic applications. Here, taking Cs Pb Br3 as an example, we reported QCE in all-inorganic halide perovskite in two-dimensional（2D） nanoplates. Blue shifts in optical absorption and photoluminescence spectra were found to be stronger in thinner nanoplates than that in thicker nanoplates, whose thickness lowered below -7 nm. The exciton binding energy results showed similar trend as that obtained for the optical absorption and photoluminescence. Meanwile, the function of integrated intensity and full width at half maximum and temperature also showed similar results, further supporting our conclusions. The results displayed the QCE in all-inorganic halide perovskite nanoplates and helped to design the all-inorganic halide perovskites with desired optical properties.

关键词： quantum confinement effect all-inorganic halide perovskites nanoplates temperature dependence luminescence

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Critical Role of Grain Boundary Behavior in all-inorganic halide perovskites Solar

Critical Role of Grain Boundary Behavior in All-Inorganic Ha...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者：胡子阳王琰琰张京诸跃进 Department of Microelectronic Science and Engineering Ningbo University

all-inorganic halide perovskite(AIHP) is becoming one of the most promising generation materials of perovskite photovoltaics for commercialization due to its thermodynamic stability and soared *** on material properties,grain boundary(GB) has detrimental or beneficial effect on device photovoltaic *** GB behavior in organic-inorganic hybrid perovskite has been extensively investigated,few attentions are paid to GB behavior in ***,we present Kelvin probe force microscopy(KPFM) and conductive atomic force microscopy(c-AFM) measurements to investigate the local GB behavior in *** measurements reveal a lower surface potential at GBs as compared to grain interiors(GIs),suggesting a significant upward band bending around GBs.C-AFM measurements show a higher current flow in the vicinity of GBs,indicating enhanced carrier separation and collection taking place at ***,the existence of ion motion was evidenced both by the single-point c-AFM measurement and voltage-controlled KPFM measurement,which accounts for the common current hysteresis behavior in AIHP solar *** investigations provide an advanced understanding of the role of GBs in AIHP and further inspiration for how to optimize device performance up to the levels of organic-inorganic hybrid perovskite.

关键词： all-inorganic halide perovskites solar cells grain boundaries scanning probe microscopy ion migration

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