Energy Level Alignment at Metal/Solution-Processed Organic Semiconductor Interfaces

Funding Agencies|European Research Council [257654-SPINTROS]; Spanish MINECO [MAT2015-65159-R]; Basque Government [PC2015-1-01, PRE_2016_2_0025]; Deutsche Forschungsgemeinschaft [OR 349/1-1]
Energy barriers between the metal Fermi energy and the molecular levels of organic semiconductor devoted to charge transport play a fundamental role in the performance of organic electronic devices. Typically, techniques such as electron photoemission spectroscopy, Kelvin probe measurements, and in-device hot-electron spectroscopy have been applied to study these interfacial energy barriers. However, so far there has not been any direct method available for the determination of energy barriers at metal interfaces with n-type polymeric semiconductors. This study measures and compares metal/solution-processed electron-transporting polymer interface energy barriers by in-device hot-electron spectroscopy and ultraviolet photoemission spectroscopy. It not only demonstrates in-device hot-electron spectroscopy as a direct and reliable technique for these studies but also brings it closer to technological applications by working ex situ under ambient conditions. Moreover, this study determines that the contamination layer coming from air exposure does not play any significant role on the energy barrier alignment for charge transport. The theoretical model developed for this work confirms all the experimental observations.

Braun, SlawomirLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)slama19 (author)
Arnold, ThorstenTechnical University of Dresden, Germany (author)
Sun, XiangnanNational Centre Nanosci and Technology, Peoples R China (author)
Parui, SubirCIC NanoGUNE, Spain (author)
Liu, XianjieLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)xiali21 (author)
Gozalvez, CristianUniversity of Basque Country UPV EHU, Spain (author)
Llopis, RogerCIC NanoGUNE, Spain (author)
Mateo-Alonso, AurelioUniversity of Basque Country UPV EHU, Spain; Basque Fdn Science, Spain (author)
Casanova, FelixCIC NanoGUNE, Spain; Basque Fdn Science, Spain (author)
Ortmann, FrankTechnical University of Dresden, Germany (author)
Fahlman, MatsLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)matfa21 (author)
Hueso, Luis E.CIC NanoGUNE, Spain; Basque Fdn Science, Spain (author)
CIC NanoGUNE, SpainYtors Fysik och Kemi (creator_code:org_t)

By the author/editor: Atxabal, Ainhoa; Braun, Slawomir; Arnold, Thorsten; Sun, Xiangnan; Parui, Subir; Liu, Xianjie; show more...; Gozalvez, Cristi ...; Llopis, Roger; Mateo-Alonso, Au ...; Casanova, Felix; Ortmann, Frank; Fahlman, Mats; Hueso, Luis E.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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