TY - JOUR
T1 - Thermoelectric enhancement in single organic radical molecules
AU - Hurtado-Gallego, Juan
AU - Sangtarash, Sara
AU - Davidson, Ross
AU - Rincón-García, Laura
AU - Daaoub, Abdalghani
AU - Rubio-Bollinger, Gabino
AU - Lambert, Colin J.
AU - Oganesyan, Vasily S.
AU - Bryce, Martin R.
AU - Agraït, Nicolás
AU - Sadeghi, Hatef
N1 - Funding Information:
H.S. acknowledges the UKRI for Future Leaders Fellowship number MR/S015329/2. S.S. acknowledges the Leverhulme Trust for Early Career Fellowship no. ECF-2018-375. J.H.-G., R.D., L.R.-G., C.J.L, M.R.B., and N.A. acknowledge funding from EC H2020 FET Open project grant agreement number 767187 “QuIET”. M.R.B. thanks EPSRC grant EP/K0394/23/1 and EC H2020 FET Open project grant agreement number 766853 “EFINED” for funding. N.A. and L.R.-G. acknowledge funding from the Education and Research Council of the Comunidad de Madrid and the European Social Fund (ref. PEJD-2019-POST/IND-16353). N.A. and G.R.-B. acknowledge funding from the Comunidad de Madrid NANOMAGCOST-CM (P2018/NMT-4321) and from the Spanish Ministry of Science and Innovation, through grants MAT2017-88693-R and the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). V.S.O. acknowledges support from EPRSC (Grant EP/P007554/1).
Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society.
PY - 2022/1/24
Y1 - 2022/1/24
N2 - Organic thermoelectric materials have potential for wearable heating, cooling, and energy generation devices at room temperature. For this to be technologically viable, high-conductance (G) and high-Seebeck-coefficient (S) materials are needed. For most semiconductors, the increase in S is accompanied by a decrease in G. Here, using a combined experimental and theoretical investigation, we demonstrate that a simultaneous enhancement of S and G can be achieved in single organic radical molecules, thanks to their intrinsic spin state. A counterintuitive quantum interference (QI) effect is also observed in stable Blatter radical molecules, where constructive QI occurs for a meta-connected radical, leading to further enhancement of thermoelectric properties. Compared to an analogous closed-shell molecule, the power factor is enhanced by more than 1 order of magnitude in radicals. These results open a new avenue for the development of organic thermoelectric materials operating at room temperature.
AB - Organic thermoelectric materials have potential for wearable heating, cooling, and energy generation devices at room temperature. For this to be technologically viable, high-conductance (G) and high-Seebeck-coefficient (S) materials are needed. For most semiconductors, the increase in S is accompanied by a decrease in G. Here, using a combined experimental and theoretical investigation, we demonstrate that a simultaneous enhancement of S and G can be achieved in single organic radical molecules, thanks to their intrinsic spin state. A counterintuitive quantum interference (QI) effect is also observed in stable Blatter radical molecules, where constructive QI occurs for a meta-connected radical, leading to further enhancement of thermoelectric properties. Compared to an analogous closed-shell molecule, the power factor is enhanced by more than 1 order of magnitude in radicals. These results open a new avenue for the development of organic thermoelectric materials operating at room temperature.
KW - Energy harvesting
KW - organic thermoelectricity
KW - quantum transport
KW - single radical molecules
UR - http://www.scopus.com/inward/record.url?scp=85124333518&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.1c03698
DO - 10.1021/acs.nanolett.1c03698
M3 - Article
C2 - 35073099
AN - SCOPUS:85124333518
VL - 22
SP - 948
EP - 953
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 3
ER -