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通过 CELIV 技术揭示氧化铅中的电荷输运机制。

Charge transport mechanism in lead oxide revealed by CELIV technique.

机构信息

Chemistry and Material Science Program, Lakehead University, 955 Oliver Road, Thunder Bay, ON, P7B 5E1, Canada.

Department of Solid State Electronics, Vilnius University, Saulėtekio 9 III k., 10222 Vilnius, Lithuania.

出版信息

Sci Rep. 2016 Sep 15;6:33359. doi: 10.1038/srep33359.

DOI:10.1038/srep33359
PMID:27628537
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5024125/
Abstract

Although polycrystalline lead oxide (PbO) belongs to the most promising photoconductors for optoelectronic and large area detectors applications, the charge transport mechanism in this material still remains unclear. Combining the conventional time-of-flight and the photo-generated charge extraction by linear increasing voltage (photo-CELIV) techniques, we investigate the transport of holes which are shown to be the faster carriers in poly-PbO. Experimentally measured temperature and electric field dependences of the hole mobility suggest a highly dispersive transport. In order to analyze the transport features quantitatively, the theory of the photo-CELIV is extended to account for the dispersive nature of charge transport. While in other materials with dispersive transport the amount of dispersion usually depends on temperature, this is not the case in poly-PbO, which evidences that dispersive transport is caused by the spatial inhomogeneity of the material and not by the energy disorder.

摘要

虽然多晶氧化铅 (PbO) 属于最有前途的光电导材料和大面积探测器应用材料，但该材料中的电荷输运机制仍不清楚。我们结合传统的飞行时间和线性增加电压的光生电荷提取 (photo-CELIV) 技术，研究了空穴的输运，空穴被证明是多晶-PbO 中的更快载流子。实验测量的空穴迁移率随温度和电场的变化表明，其输运具有高度的分散性。为了定量分析输运特性，将 photo-CELIV 的理论扩展到考虑电荷输运的分散性。在其他具有分散输运的材料中，分散的程度通常取决于温度，但在多晶-PbO 中并非如此，这表明分散输运是由材料的空间非均质性引起的，而不是由能量无序引起的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/c9bee70d5273/srep33359-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/b2f0dc6c9787/srep33359-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/03a88a6a72e3/srep33359-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/065ccbdcea0e/srep33359-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/4a1208d0c89e/srep33359-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/0a6815613ccb/srep33359-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/d11ca8ac02ae/srep33359-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/c9bee70d5273/srep33359-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/b2f0dc6c9787/srep33359-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/03a88a6a72e3/srep33359-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/065ccbdcea0e/srep33359-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/4a1208d0c89e/srep33359-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/0a6815613ccb/srep33359-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/d11ca8ac02ae/srep33359-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b12/5024125/c9bee70d5273/srep33359-f7.jpg

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