Dielectric materials for organic (light-emitting) transistors
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School of Electrical Engineering |
Doctoral thesis (article-based)
| Defence date: 2025-08-22
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Language
en
Pages
77 + app. 57
Series
Aalto University publication series Doctoral Theses, 123/2025
Abstract
Organic semiconductors, characterized by van der Waals bonding, exhibit properties such as light weight, flexibility, and compatibility with low-temperature processing. These characteristics offer numerous advantages for large-scale and cost-effective manufacturing processes, rendering them highly relevant to the semiconductor industry and new-generation electronics. Currently, applications of organic devices are prevalent in displays, lighting, and solar cells, with organic light-emitting diodes leading the market. Following the development of organic light-emitting diodes, organic light-emitting transistors have emerged as promising devices that integrate light emission with the switching functionalities of transistors. Despite their potential to exceed the efficiency of diodes, fabricating high-performance light-emitting transistors requires precise material selection and optimization. A critical element in this context is the gate dielectric layer, which significantly impacts charge accumulation and charge transport at the interface with the organic semiconductor. This dissertation investigates distinct dielectric materials and their impact on the performance of organic (light-emitting) transistors. To this end, four types of dielectrics were evaluated: low-k polymer, high-k ferroelectric polymer, inorganic/organic bilayer, and biopolymer. By examining dielectric properties, this research aims to identify optimal material systems that can improve overall device performance, particularly regarding charge carrier transport and light-emission efficiency. The insights derived from this study are expected to contribute to developing advanced, high-performance electronic devices.Description
Supervising professor
Soldano, Caterina, Prof., Aalto University, Department of Electronics and Nanoengineering, FinlandOther note
Parts
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[Publication 1]: A. ALBELTAGI, K. GALLEGOS-ROSAS, AND C. SOLDANO "High-k Fluoropolymers Dielectrics for Low-Bias Ambipolar Organic Light Emitting Transistors (OLETs)", Materials, vol. 14, no. 24, p. 7635, 2021.
Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-2021123111091DOI: 10.3390/ma14247635 View at publisher
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[Publication 2]: C. SOLDANO, O. LAOUADI, AND K. GALLEGOS-ROSAS "TCTA:Ir(ppy)3 Green Emissive Blends in Organic Light-Emitting Transistors (OLETs)", ACS Omega, vol. 7, no. 48, pp. 43719-43728, 2022.
Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202301021069DOI: 10.1021/acsomega.2c04718 View at publisher
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[Publication 3]: K. GALLEGOS-ROSAS, P. MYLLYMÄKI, M. SAARNIHEIMO, S. SNECK, R. RAJU, AND C. SOLDANO "Hafnium Aluminate–Polymer Bilayer Dielectrics for Organic Light-Emitting Transistors (OLETs)", ACS Applied Electronic Materials, vol. 6, no. 2, pp. 1493-1503, 2024.
Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202403202883DOI: 10.1021/acsaelm.3c01813 View at publisher
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[Publication 4]: K. GALLEGOS-ROSAS, A. AZARI, AND C. SOLDANO "Carboxymethyl Cellulose as a Sustainable Dielectric Material for Organic Field-Effect Transistors", ACS Applied Electronic Materials, vol.7, no. 3, pp. 1274-1282, 2025.
Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202503122743DOI: 10.1021/acsaelm.4c02227 View at publisher