Up to now, perovskite solar cells(PSCs) have reached a certified 25.5% efficiency. As a promising photo-electric material, the metal halide perovskite possesses many outstanding properties such as tunable bandgap, lon...Up to now, perovskite solar cells(PSCs) have reached a certified 25.5% efficiency. As a promising photo-electric material, the metal halide perovskite possesses many outstanding properties such as tunable bandgap, long diffusion length, high absorption coefficient and carrier mobility. In spite of these remarkable properties, defects are inevitable during the solution processing. Therefore, many efforts have been made to reduce defects in perovskite films and thus improve the performance of devices. Among them,substitution or doping engineering is one of the most studied methods. Meanwhile, due to the poor stability of the organic-inorganic hybrid perovskite and the toxicity of Pb-based perovskite materials, all inorganic perovskite and lead-less or lead-free perovskite have emerged as promising materials. Here,we focus on the defect engineering especially substitutions on different sites in an ABX_(3) structure. The particular attention is devoted towards lead-less or lead-free perovskites, and we discuss several common elements or groups used to partially replace Pb^(2+). It is noted that proper elemental doping at different sites is an important guarantee for obtaining high-performance lead-less or lead-free PSCs.展开更多
基金financially supported by the National Key Research and Development Program of China (Grant No.2018YFB2202900)the National Natural Science Foundation of China (Grant Nos. 52192610, 61704131)+3 种基金the Key Research and Development Program of Shaanxi Province (Grant No. 2020GY-310)the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University (Grant No. 2020GXLH-Z-018)the Fundamental Research Funds for the Central Universitiesthe Innovation Fund of Xidian University。
文摘Up to now, perovskite solar cells(PSCs) have reached a certified 25.5% efficiency. As a promising photo-electric material, the metal halide perovskite possesses many outstanding properties such as tunable bandgap, long diffusion length, high absorption coefficient and carrier mobility. In spite of these remarkable properties, defects are inevitable during the solution processing. Therefore, many efforts have been made to reduce defects in perovskite films and thus improve the performance of devices. Among them,substitution or doping engineering is one of the most studied methods. Meanwhile, due to the poor stability of the organic-inorganic hybrid perovskite and the toxicity of Pb-based perovskite materials, all inorganic perovskite and lead-less or lead-free perovskite have emerged as promising materials. Here,we focus on the defect engineering especially substitutions on different sites in an ABX_(3) structure. The particular attention is devoted towards lead-less or lead-free perovskites, and we discuss several common elements or groups used to partially replace Pb^(2+). It is noted that proper elemental doping at different sites is an important guarantee for obtaining high-performance lead-less or lead-free PSCs.
基金supported by the National Natural Science Foundation of China (52192610 and 62274127)the National Key Research and Development Program of China (2021YFA0715600, 2021YFA0717700 and 2018YFB2202900)+1 种基金Wuhu and Xidian University Special Fund for Industry-University Research Cooperationthe Fundamental Research Funds for the Central Universities。
文摘低维非铅金属卤化物材料因其优异的光电特性在可见光盲紫外探测领域具有很大的潜力.本文通过吡啶添加剂辅助一步溶液法成功制备了高质量类钙钛矿CsAg_(2)I_(3)薄膜,该薄膜展示出p型及202 meV低激子结合能(Eb).其Eb甚至和2D铅卤钙钛矿相当,有利于光生载流子分离.此外,探索了基于type-Ⅱ型n-p异质结SnO_(2)/CsAg_(2)I_(3)的自驱动紫外探测器,其中4.13 eV宽带隙、0.214 eV低Urbach能量的SnO_(2)的引入抑制了持续光电导效应.所制备的探测器件具有高灵敏特性及在可见光盲紫外探测器中超快的响应时间(47/74μs),大致快于当前CsAg_(2)I_(3)探测器数值的两个数量级.其响应度和探测率分别高达0.032 A W^(-1)和1.2×10^(11)Jones.此外,异质结>90%高可见光透光性展现出优越的可见光盲特性.这种优异的器件性能、可溶液法制备及长期稳定性为未来可见光盲、自驱动、稳定、环保的商用紫外探测器的制备提供了新思路.
