title: Influence of high-pressure treatment on charge carrier transport in PbS colloidal quantum dot solids.
abstract: We investigated the effects of high-pressure treatment on charge carrier transport in PbS colloidal quantum dot (CQD) solids. We applied high pressure to PbS CQD solids using nitrogen gas to reduce the inter-dot distance. Using this simple process, we obtained conductive PbS CQD solids. Terahertz time-domain spectroscopy was used to study charge carrier transport as a function of pressure. We found that the minimum pressure needed to increase the dielectric constant, conductivity, and carrier mobility was 4 MPa. All properties dramatically improved at 5 MPa; for example, the mobility increased from 0.13 cm(2) V(-1) s(-1) at 0.1 MPa to 0.91 cm(2) V(-1) s(-1) at 5 MPa. We propose this simple process as a nondestructive approach for making conductive PbS CQD solids that are free of chemical and physical defects.
authors.affiliation: School of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea. hjk3@yonsei.ac.kr.
authors.forename: Seung Jin
authors.initials: SJ
authors.lastname: Heo
authors.forename: Seokhyun
authors.initials: S
authors.lastname: Yoon
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Oh
authors.forename: Doo Hyun
authors.initials: DH
authors.lastname: Yoon
authors.forename: Hyun Jae
authors.initials: HJ
authors.lastname: Kim