PMID- 31197239
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20231012
IS  - 2045-2322 (Electronic)
IS  - 2045-2322 (Linking)
VI  - 9
IP  - 1
DP  - 2019 Jun 13
TI  - Grain Boundary Interfaces Controlled by Reduced Graphene Oxide in 
      Nonstoichiometric SrTiO(3-delta) Thermoelectrics.
PG  - 8624
LID - 10.1038/s41598-019-45162-7 [doi]
LID - 8624
AB  - Point defect or doping in Strontium titanium oxide (STO) largely determines the 
      thermoelectric (TE) properties. So far, insufficient knowledge exists on the 
      impact of double Schottky barrier on the TE performance. Herein, we report a 
      drastic effect of double Schottky barrier on the TE performance in undoped STO. 
      It demonstrates that incorporation of Reduced Graphene Oxide (RGO) into undoped 
      STO weakens the double Schottky barrier and thereby results in a simultaneous 
      increase in both carrier concentration and mobility of undoped STO. The enhanced 
      mobility exhibits single crystal-like behavior. This increase in the carrier 
      concentration and mobility boosts the electrical conductivity and power factor of 
      undoped STO, which is attributed to the reduction of the double Schottky barrier 
      height and/or the band alignment of STO and RGO that allow the charge transfer 
      through the interface at grain boundaries. Furthermore, this STO/RGO interface 
      also enhances the phonon scattering, which results in low thermal conductivity. 
      This strategy significantly increases the ratio of sigma/kappa, resulting in an 
      enhancement in ZT as compared with pure undoped STO. This study opens a new 
      window to optimize the TE properties of many candidate materials.
FAU - Rahman, Jamil Ur
AU  - Rahman JU
AD  - Energy & Environmental Materials Division, Korea Institute of Ceramic Engineering 
      & Technology, Jinju, 52861, South Korea.
AD  - School of Materials Science and Engineering, Changwon National University, 
      Changwon, 51140, South Korea.
FAU - Du, Nguyen Van
AU  - Du NV
AD  - Energy & Environmental Materials Division, Korea Institute of Ceramic Engineering 
      & Technology, Jinju, 52861, South Korea.
AD  - School of Materials Science and Engineering, Changwon National University, 
      Changwon, 51140, South Korea.
FAU - Nam, Woo Hyun
AU  - Nam WH
AD  - Energy & Environmental Materials Division, Korea Institute of Ceramic Engineering 
      & Technology, Jinju, 52861, South Korea.
FAU - Shin, Weon Ho
AU  - Shin WH
AD  - Energy & Environmental Materials Division, Korea Institute of Ceramic Engineering 
      & Technology, Jinju, 52861, South Korea.
FAU - Lee, Kyu Hyoung
AU  - Lee KH
AD  - Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, 
      South Korea.
FAU - Seo, Won-Seon
AU  - Seo WS
AD  - Energy & Environmental Materials Division, Korea Institute of Ceramic Engineering 
      & Technology, Jinju, 52861, South Korea.
FAU - Kim, Myong Ho
AU  - Kim MH
AD  - School of Materials Science and Engineering, Changwon National University, 
      Changwon, 51140, South Korea.
FAU - Lee, Soonil
AU  - Lee S
AD  - School of Materials Science and Engineering, Changwon National University, 
      Changwon, 51140, South Korea. leesoonil@changwon.ac.kr.
LA  - eng
PT  - Journal Article
DEP - 20190613
PL  - England
TA  - Sci Rep
JT  - Scientific reports
JID - 101563288
PMC - PMC6565681
COIS- The authors declare no competing interests.
EDAT- 2019/06/15 06:00
MHDA- 2019/06/15 06:01
PMCR- 2019/06/13
CRDT- 2019/06/15 06:00
PHST- 2018/10/21 00:00 [received]
PHST- 2019/05/24 00:00 [accepted]
PHST- 2019/06/15 06:00 [entrez]
PHST- 2019/06/15 06:00 [pubmed]
PHST- 2019/06/15 06:01 [medline]
PHST- 2019/06/13 00:00 [pmc-release]
AID - 10.1038/s41598-019-45162-7 [pii]
AID - 45162 [pii]
AID - 10.1038/s41598-019-45162-7 [doi]
PST - epublish
SO  - Sci Rep. 2019 Jun 13;9(1):8624. doi: 10.1038/s41598-019-45162-7.