Design Strategy for Improving Optical and Electrical Properties and Stability of Lead-Halide Semiconductors
Design Strategy for Improving Optical and Electrical Properties and Stability of Lead-Halide Semiconductors
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提高卤化铅半导体光电性能和稳定性的设计策略
DOI：
10.1021/jacs.7b10101
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发表时间：
2018-02-28
影响因子：
15
通讯作者：
Guo, Guo-Cong
中科院分区：
文献类型：
--
作者：
Sun, Cai;Xu, Gang;Guo, Guo-Cong
光吸收剂在太阳能电池上的实际应用需要广泛的吸收、长寿命的光生载流子、高电导率和高稳定性。无机-有机杂化卤化铅材料在太阳能电池中显示出巨大的应用潜力。这项工作提供了一种新的设计策略来提高这些材料的吸收范围、电导、光电导和稳定性。我们通过将光活性紫精两性离子以配位模式掺入到氯化铅体系中，合成了一种新型光致变色氯化铅半导体。该半导体具有新颖的无机-有机杂化结构，其中一维半导体无机氯化铅纳米带与一维半导体有机π聚集体共价键合。它对光、热和湿气表现出高度稳定性。经过光致电子转移 (PIET) 后，它会产生长寿命的电荷分离态，吸收带覆盖 200-900 nm 区域，同时增加其电导和光电导。这项工作是首次利用PIET对半导体的光电导进行修饰。观察到的电导率增加倍数达到了 3 个数量级，这代表了光开关半导体的记录。增加的光电流主要来自半导体有机π聚集体，这表明有机会通过修饰有机成分来提高光电流。这些发现有助于探索太阳能电池的光吸收剂。广阔
Broad absorption, long-lived photogenerated carriers, high conductance, and high stability are all required for a light absorber toward its real application on solar cells. Inorganic-organic hybrid lead halide materials have shown tremendous potential for applications in solar cells. This work offers a new design strategy to improve the absorption range, conductance, photoconductance, and stability of these materials. We synthesized a new photochromic lead-chloride semiconductor by incorporating a photoactive viologen zwitterion into a lead-chloride system in the coordinating mode. This semiconductor has a novel inorganic-organic hybrid structure, where 1-D semiconducting inorganic lead-chloride nanoribbons covalently bond to 1-D semiconducting organic pi-aggregates. It shows high stability against light, heat, and moisture. After photoinduced electron transfer (PIET), it yields a long-lived charge-separated state with a absorption band covering the 200-900 nm region while increasing its conductance and photoconductance. This work is the first to modify the photoconductance of semiconductors by PIET. The observed increasing times of conductivity reached 3 orders of magnitude, which represents a record for photoswitchable semiconductors. The increasing photocurrent comes mainly from the semiconducting organic pi-aggregates, which indicates a chance to improve the photocurrent by modifying the organic component. These findings contribute to the exploration of light absorbers for solar cells. broad