Year: 2022
Type: article
Abstract: Thin-film thermoelectrics (TEs) with a thickness of a few microns present an attractive opportunity to power the internet of things (IoT). Here, we propose screen printing as an industry-relevant technology to fabricate TE thin films from colloidal PbSe quantum dots (QDs). Monodisperse 13 nm-sized PbSe QDs with spherical morphology were synthesized through a straightforward heating-up method. The cubic-phase PbSe QDs with homogeneous chemical composition allowed the formulation of a novel ink to fabricate 2 μm-thick thin films through robust screen printing followed by rapid annealing. A maximum Seebeck coefficient of 561 μV K−1 was obtained at 143 °C and the highest electrical conductivity of 123 S m−1 was reached at 197 °C. Power factor calculations resulted in a maximum value of 2.47 × 10−5 W m−1 K−2 at 143 °C. To the best of our knowledge, the observed Seebeck coefficient value is the highest reported for TE thin films fabricated by screen printing. Thus, this study highlights that increased Seebeck coefficients can be obtained by using QD building blocks owing to quantum confinement.
Source: Materials
DOI: 10.3390/ma15248805
Authors: Viviana Sousa, Guillaume Savelli, Oleg I. Lebedev, Kirill Kovnir, José H. Correia, Eliana M. F. Vieira, Pedro Alpuim, Yury V. Kolen’ko
Institutions: International Iberian Nanotechnology Laboratory, University of Minho, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Laboratoire d’Innovation pour les Technologies des Énergies Nouvelles et les nanomatériaux, Centre National de la Recherche Scientifique, École Nationale Supérieure d'Ingénieurs de Caen, Laboratoire de Cristallographie et Sciences des Matériaux, United States Department of Energy, Iowa State University, Ames National Laboratory, Labbels
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,408
Awards: G1085977725, European Infrastructure Powering the Internet of Things, G1334979847, G1516346500, G1990805107, G340864225, G434337789, Unconventional Thermoelectrics Based on Self-Organized Nanocrystal Superlattices, Centro de Física das Universidades do Minho e do Porto, G6414639299, G6604332155, Unidade de Investigação em Microssistemas Eletromecânicos, Unidade de Investigação em Microssistemas Eletromecânicos, G8719584337
OpenAlex ID: W4311978802