PMID- 29346726
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20190315
LR  - 20190315
IS  - 1936-086X (Electronic)
IS  - 1936-0851 (Linking)
VI  - 12
IP  - 2
DP  - 2018 Feb 27
TI  - The Effect of Dielectric Environment on Doping Efficiency in Colloidal PbSe 
      Nanostructures.
PG  - 1313-1320
LID - 10.1021/acsnano.7b07602 [doi]
AB  - Doping, as a central strategy to control free carrier type and concentration in 
      semiconductor materials, suffers from low efficiency at the nanoscale, especially 
      in systems having high permittivity (ϵ) and large Bohr radii, such as lead 
      chalcogenide nanocrystals (NCs) and nanowires (NWs). Here, we study dielectric 
      confinement effects on the doping efficiency of lead chalcogenides nanostructures 
      by integrating PbSe NWs in the platform of field effect transistors (FETs). 
      Elemental Pb or In or elemental Se is deposited by thermal evaporation to 
      remotely n- or p-dope the NWs. Polymeric and oxide materials of varying ϵ are 
      subsequently deposited to control the dielectric environment surrounding the NWs. 
      Analyzing the device characteristics, we extract the change of carrier 
      concentration introduced by tailoring the dielectric environment. The calculated 
      doping efficiency for n-type (Pb/In) and p-type (Se) dopants increases as the ϵ 
      of the surrounding medium increases. Using a high-ϵ material, such as HfO(2) for 
      encapsulation, the doping efficiency can be enhanced by >10-fold. A theoretical 
      model is built to describe the doping efficiency in PbSe NWs embedded in 
      different dielectric environments, which agrees with our experimental data for 
      both NW array and single NW devices. As dielectric confinement affects all 
      low-dimensional materials, engineering the dielectric environment is a promising 
      general approach to enhance doping concentrations, without introducing excess 
      impurities that may scatter carriers, and is suitable for various device 
      applications.
FAU - Zhao, Qinghua
AU  - Zhao Q
AUID- ORCID: 0000-0001-5483-1203
AD  - Department of Chemistry, double daggerDepartment of Materials Science and Engineering, and 
       section signDepartment of Electrical and Systems Engineering, University of Pennsylvania , 
      Philadelphia, Pennsylvania 19104, United States.
FAU - Zhao, Tianshuo
AU  - Zhao T
AD  - Department of Chemistry, double daggerDepartment of Materials Science and Engineering, and 
       section signDepartment of Electrical and Systems Engineering, University of Pennsylvania , 
      Philadelphia, Pennsylvania 19104, United States.
FAU - Guo, Jiacen
AU  - Guo J
AD  - Department of Chemistry, double daggerDepartment of Materials Science and Engineering, and 
       section signDepartment of Electrical and Systems Engineering, University of Pennsylvania , 
      Philadelphia, Pennsylvania 19104, United States.
FAU - Chen, Wenxiang
AU  - Chen W
AD  - Department of Chemistry, double daggerDepartment of Materials Science and Engineering, and 
       section signDepartment of Electrical and Systems Engineering, University of Pennsylvania , 
      Philadelphia, Pennsylvania 19104, United States.
FAU - Zhang, Mingliang
AU  - Zhang M
AD  - Department of Chemistry, double daggerDepartment of Materials Science and Engineering, and 
       section signDepartment of Electrical and Systems Engineering, University of Pennsylvania , 
      Philadelphia, Pennsylvania 19104, United States.
FAU - Kagan, Cherie R
AU  - Kagan CR
AD  - Department of Chemistry, double daggerDepartment of Materials Science and Engineering, and 
       section signDepartment of Electrical and Systems Engineering, University of Pennsylvania , 
      Philadelphia, Pennsylvania 19104, United States.
LA  - eng
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20180123
PL  - United States
TA  - ACS Nano
JT  - ACS nano
JID - 101313589
OTO - NOTNLM
OT  - PbSe
OT  - dielectric confinement
OT  - doping
OT  - nanocrystal
OT  - nanowire
EDAT- 2018/01/19 06:00
MHDA- 2018/01/19 06:01
CRDT- 2018/01/19 06:00
PHST- 2018/01/19 06:00 [pubmed]
PHST- 2018/01/19 06:01 [medline]
PHST- 2018/01/19 06:00 [entrez]
AID - 10.1021/acsnano.7b07602 [doi]
PST - ppublish
SO  - ACS Nano. 2018 Feb 27;12(2):1313-1320. doi: 10.1021/acsnano.7b07602. Epub 2018 
      Jan 23.