TY - JOUR
T1 - Enhanced thermoelectric properties of Sb2Te3 and Bi2Te3 films for flexible thermal sensors
AU - Vieira, Eliana M. F.
AU - Figueira, Joana
AU - Pires, Ana Lúcia
AU - Grilo, José
AU - Silva, Manuel F.
AU - Pereira, André M.
AU - Gonçalves, Luis Miguel
N1 - info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F95905%2F2013/PT#
UID/EEA/04436/2013
POCI-01-0145-FEDER-006941
POCI-01-0145-FEDER-016723
SFRH/BD/121679/2016
Sem PDF conforme despacho.
PY - 2019/2/5
Y1 - 2019/2/5
N2 - Improved thermoelectric properties of p-Sb2Te3 and n-Bi2Te3 films deposited by thermal co-evaporation at 503 K and 543 K, respectively, are reported, by using two types of substrate (borosilicate glass and 25 μm - Kapton® polyimide). Seebeck coefficients of 194 μV K−1 and - 233 μV K−1 and electrical conductivities of 3.2 × 104 (Ω m)−1 and 5.0 × 104 (Ω m)−1, lead to optimized power factors of 1.2 × 10−3 W K−2 m−1 and 2.7 × 10−3 W K−2 m−1, measured at 298 K, for flexible Sb2Te3 and Bi2Te3 films, respectively. The power factor value increases until a maximum of 2.3 × 10−3 W m−1 K−2 for the p-type film, and to 5.9 × 10−3 W m−1 K−2 for the n-type film, at 373 K, respectively. An improvement of more than two times on the power factor value is observed when compared with the actual state-of-art for flexible Sb2Te3 and Bi2Te3 films, at room temperature, with thickness below 1 μm. A flexible thermopile sensor based on p - n films is presented, into possible thermal sensing. The thermoelectric device shows a responsivity of 0.05 V W−1 and a specific detectivity of 1.6 × 107 cm √Hz W−1.
AB - Improved thermoelectric properties of p-Sb2Te3 and n-Bi2Te3 films deposited by thermal co-evaporation at 503 K and 543 K, respectively, are reported, by using two types of substrate (borosilicate glass and 25 μm - Kapton® polyimide). Seebeck coefficients of 194 μV K−1 and - 233 μV K−1 and electrical conductivities of 3.2 × 104 (Ω m)−1 and 5.0 × 104 (Ω m)−1, lead to optimized power factors of 1.2 × 10−3 W K−2 m−1 and 2.7 × 10−3 W K−2 m−1, measured at 298 K, for flexible Sb2Te3 and Bi2Te3 films, respectively. The power factor value increases until a maximum of 2.3 × 10−3 W m−1 K−2 for the p-type film, and to 5.9 × 10−3 W m−1 K−2 for the n-type film, at 373 K, respectively. An improvement of more than two times on the power factor value is observed when compared with the actual state-of-art for flexible Sb2Te3 and Bi2Te3 films, at room temperature, with thickness below 1 μm. A flexible thermopile sensor based on p - n films is presented, into possible thermal sensing. The thermoelectric device shows a responsivity of 0.05 V W−1 and a specific detectivity of 1.6 × 107 cm √Hz W−1.
KW - Antimony telluride
KW - Bismuth telluride
KW - Flexible thermal sensor
KW - Kapton substrate
KW - Thermoelectric effect
UR - http://www.scopus.com/inward/record.url?scp=85054650544&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2018.09.324
DO - 10.1016/j.jallcom.2018.09.324
M3 - Article
AN - SCOPUS:85054650544
SN - 0925-8388
VL - 774
SP - 1102
EP - 1116
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -