Document Type
Article
Language
eng
Format of Original
5 p.
Publication Date
2015
Publisher
American Chemical Society
Source Publication
Journal of Physical Chemistry Letters
Source ISSN
1948-7185
Original Item ID
DOI: 10.1021/acs.jpclett.5b01078, PMID: 26266846
Abstract
CuS nanocrystals are potential materials for developing low-cost solar energy conversion devices. Understanding the underlying dynamics of photoinduced carriers in CuS nanocrystals is essential to improve their performance in these devices. In this work, we investigated the photoinduced hole dynamics in CuS nanodisks (NDs) using the combination of transient optical (OTA) and X-ray (XTA) absorption spectroscopy. OTA results show that the broad transient absorption in the visible region is attributed to the photoinduced hot and trapped holes. The hole trapping process occurs on a subpicosecond time scale, followed by carrier recombination (~100 ps). The nature of the hole trapping sites, revealed by XTA, is characteristic of S or organic ligands on the surface of CuS NDs. These results not only suggest the possibility to control the hole dynamics by tuning the surface chemistry of CuS but also represent the first time observation of hole dynamics in semiconductor nanocrystals using XTA.
Recommended Citation
Ludwig, John; An, Li; Pattengale, Brian; Kong, Qingyu; Zhang, Xiaoyi; Xi, Pinxian; and Huang, Jier, "Ultrafast Hole Trapping and Relaxation Dynamics in p-Type CuS Nanodisks" (2015). Chemistry Faculty Research and Publications. 471.
https://epublications.marquette.edu/chem_fac/471
Comments
Accepted version. Journal of Physical Chemistry Letters, Vol. 6, No. 14 (2015): 2671-2675. DOI. © 2015 American Chemical Society. Used with permission.