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An article on chemical doping of OFETs in the Advanced Materials Women in Materials Science special issue

The article "Chemical Doping of the Organic Semiconductor C8-BTBT-C8 Using an Aqueous Iodine Solution for Device Mobility Enhancement" is chosen to be included in the Advanced Materials " Women in Materials Science" virtual issue.
Anna May
17 August 2022
Organic electronics sample | ICMAB-CSIC
Organic electronics sample | ICMAB-CSIC

This article is on chemical doping or organic field-effect transistors using iodine solutions to enhance their performance. The article is a collaboration with the group eMolMat, led by Marta Mas-Torrent, and the Surfaces group, with Esther Barrena and Carmen Ocal. Mas-Torrent, Barrena and Ocal and three senior scientists at ICMAB, who participate in multiple research projects and activities. 

Women in Materials Science

"Advanced MaterialsAdvanced Functional MaterialsAdvanced ScienceSmall and Advanced Materials Technologies are proud and honored to support the most dedicated and enthusiastic scientists in the materials science disciplines in publishing their influential research at the highest quality standards.

The Women in Materials Science Virtual Issue will collect outstanding works created, steered, and led by women scientists around the world, showcasing the high impact these leading individuals have within the research published with us, while shaping the scientific landscape and inspiring new generations of scientists to come.

This issue will be frequently updated with the most recent and impactful articles from these top tier journals, therefore do not forget to bookmark this webpage to stay up to date with the latest contributions."

The collection "Celebrating Excellence in the Advanced Materials Family: Women in Materials Science" can be directly accessed by following this link or alternatively through the homepage of Advanced Materials clicking the "Special Features" tab and then selecting "Women in Materials Science" from the dropdown menu.
Women in ADMA


Chemical Doping of the Organic Semiconductor C8-BTBT-C8 Using an Aqueous Iodine Solution for Device Mobility Enhancement
Jinghai LiAdara BabujiInés TemiñoTommaso SalzilloFrancesco D'AmicoRaphael PfattnerCarmen OcalEsther Barrena, Marta Mas-Torrent
Adv. Mater. Technol.2022, 7, 2101535
DOI: 10.1002/admt.202101535

women science

Graphical abstract of the article

The performance of organic field-effect transistors is still severely limited by factors such as contact resistance and charge trapping. Chemical doping is considered to be a promising key enabler for improving device performance, although there is a limited number of established doping protocols as well as a lack of understanding of the doping mechanisms.

Here, a very simple doping methodology based on exposing an organic semiconductor thin film to an aqueous iodine solution is reported. The doped devices exhibit enhanced device mobility, which becomes channel-length independent, a decreased threshold voltage and a reduction in the density of interfacial traps. The device OFF current is not altered, which is in agreement with the spectroscopic data that points out that no charge transfer processes are occurring.

Kelvin probe force microscopy characterization of the devices under operando conditions unambiguously proves that an important reduction of the contact resistance takes place after their exposition to the iodine solution, reaching almost ohmic contact

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