PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications

Lead telluride (PbTe) quantum dots, despite being considered as one of the most promising candidates for future photovoltaics owing to their higher multiple exciton generation yields, have received limited attention in solar cell designs due their less explored surface chemistry and high air sensiti...

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Autores principales:	Tuğba Hacıefendioğlu, Demet Asil
Formato:	article
Lenguaje:	EN TR
Publicado:	Suleyman Demirel University 2021
Materias:	lead telluride pbte quantum dots solar cells tbai band alignment Science (General) Q1-390
Acceso en línea:	https://doaj.org/article/09004e545ef14942b2465dd26dff7367
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spelling	oai:doaj.org-article:09004e545ef14942b2465dd26dff73672021-11-26T09:49:19ZPbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications1306-757510.29233/sdufeffd.891908https://doaj.org/article/09004e545ef14942b2465dd26dff73672021-11-01T00:00:00Zhttps://dergipark.org.tr/tr/pub/sdufeffd/issue/65893/891908https://doaj.org/toc/1306-7575Lead telluride (PbTe) quantum dots, despite being considered as one of the most promising candidates for future photovoltaics owing to their higher multiple exciton generation yields, have received limited attention in solar cell designs due their less explored surface chemistry and high air sensitivity. This study demonstrates the synthesis and characterization of highly crystalline PbTe QDs and their utilization in solution processed solar cells through band alignment engineering. Ultraviolet photoelectron spectroscopy studies showed that the conduction and valence band levels depend strongly on the type of surface ligand utilized for the ligand exchange process. Conduction and valence band levels of tetrabutylammonium iodide (TBAI) and 1,2-ethanedithiol (EDT) treated PbTe QDs with respect to vacuum were measured as -3.73 eV/-4.83 eV and -3.48 eV/-4.45 eV, respectively. The presence of a band offset between the conduction and valence band levels of TBAI and EDT treated layers allowed us to engineer the band alignment in the light absorbing layer. As a result, solar cells where TBAI and EDT ligand treated QDs were utilized in a bilayer cell architecture reached a photo conversion efficiency of 0.65%.Tuğba HacıefendioğluDemet AsilSuleyman Demirel Universityarticlelead telluridepbte quantum dotssolar cellstbaiband alignmentScience (General)Q1-390ENTRSüleyman Demirel Üniversitesi Fen-Edebiyat Fakültesi Fen Dergisi, Vol 16, Iss 2, Pp 434-443 (2021)
institution	DOAJ
collection	DOAJ
language	EN TR
topic	lead telluride pbte quantum dots solar cells tbai band alignment Science (General) Q1-390
spellingShingle	lead telluride pbte quantum dots solar cells tbai band alignment Science (General) Q1-390 Tuğba Hacıefendioğlu Demet Asil PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications
description	Lead telluride (PbTe) quantum dots, despite being considered as one of the most promising candidates for future photovoltaics owing to their higher multiple exciton generation yields, have received limited attention in solar cell designs due their less explored surface chemistry and high air sensitivity. This study demonstrates the synthesis and characterization of highly crystalline PbTe QDs and their utilization in solution processed solar cells through band alignment engineering. Ultraviolet photoelectron spectroscopy studies showed that the conduction and valence band levels depend strongly on the type of surface ligand utilized for the ligand exchange process. Conduction and valence band levels of tetrabutylammonium iodide (TBAI) and 1,2-ethanedithiol (EDT) treated PbTe QDs with respect to vacuum were measured as -3.73 eV/-4.83 eV and -3.48 eV/-4.45 eV, respectively. The presence of a band offset between the conduction and valence band levels of TBAI and EDT treated layers allowed us to engineer the band alignment in the light absorbing layer. As a result, solar cells where TBAI and EDT ligand treated QDs were utilized in a bilayer cell architecture reached a photo conversion efficiency of 0.65%.
format	article
author	Tuğba Hacıefendioğlu Demet Asil
author_facet	Tuğba Hacıefendioğlu Demet Asil
author_sort	Tuğba Hacıefendioğlu
title	PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications
title_short	PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications
title_full	PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications
title_fullStr	PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications
title_full_unstemmed	PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications
title_sort	pbte quantum dots and engineering of the energy band alignment in photovoltaic applications
publisher	Suleyman Demirel University
publishDate	2021
url	https://doaj.org/article/09004e545ef14942b2465dd26dff7367
work_keys_str_mv	AT tugbahacıefendioglu pbtequantumdotsandengineeringoftheenergybandalignmentinphotovoltaicapplications AT demetasil pbtequantumdotsandengineeringoftheenergybandalignmentinphotovoltaicapplications
_version_	1718409638924255232

PbTe Quantum Dots and Engineering of the Energy Band Alignment in Photovoltaic Applications

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