Chemical doping is a powerful method to improve the charge transport and to control the conductivity in organic semi-conductors (OSs) for a wide range of electronic devices. We demonstrate protic ionic liquids (PILs) as effective p-dopant in both polymeric and small molecule OSs. In particular, we show that PILs promote single electron oxidation, which increases the hole concentration in the semiconducting film. The illustrated PIL-doping mechanism is compatible with materials processed by solution and is stable in air. We report the use of PIL-doping in hybrid solar cells based on triarylamine hole transporting materials, such as 2,2′,7,7′-tetrakis(N,N-di-p- methoxyphenyl-amine)9,9′-spirobifluorene (spiro-OMeTAD). We show improved power conversion efficiency by replacing lithium salts, typical p-dopants for spiro-OMeTAD, with PILs. We use photovoltage−photocurrent decay and photoinduced absorption spectroscopy to establish that significantly improved device performance is mainly due to reduced charge transport resistance in the hole-transporting layer, as potentiated by PIL-doping.

Protic ionic liquids as p‐dopant for organic hole transporting materials and their application in high efficiency hybrid solar cells / Abate, A.; Hollman, D. J.; Teuscher, J.; Pathak, S.; Avolio, R.; D'Errico, Gerardino; Vitiello, Giuseppe; Fantacci, S.; Snaith, H. J.. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - 135:36(2013), pp. 13538-13548. [10.1021/ja406230f]

Protic ionic liquids as p‐dopant for organic hole transporting materials and their application in high efficiency hybrid solar cells

A. Abate;D'ERRICO, GERARDINO;VITIELLO, GIUSEPPE;
2013

Abstract

Chemical doping is a powerful method to improve the charge transport and to control the conductivity in organic semi-conductors (OSs) for a wide range of electronic devices. We demonstrate protic ionic liquids (PILs) as effective p-dopant in both polymeric and small molecule OSs. In particular, we show that PILs promote single electron oxidation, which increases the hole concentration in the semiconducting film. The illustrated PIL-doping mechanism is compatible with materials processed by solution and is stable in air. We report the use of PIL-doping in hybrid solar cells based on triarylamine hole transporting materials, such as 2,2′,7,7′-tetrakis(N,N-di-p- methoxyphenyl-amine)9,9′-spirobifluorene (spiro-OMeTAD). We show improved power conversion efficiency by replacing lithium salts, typical p-dopants for spiro-OMeTAD, with PILs. We use photovoltage−photocurrent decay and photoinduced absorption spectroscopy to establish that significantly improved device performance is mainly due to reduced charge transport resistance in the hole-transporting layer, as potentiated by PIL-doping.
2013
Protic ionic liquids as p‐dopant for organic hole transporting materials and their application in high efficiency hybrid solar cells / Abate, A.; Hollman, D. J.; Teuscher, J.; Pathak, S.; Avolio, R.; D'Errico, Gerardino; Vitiello, Giuseppe; Fantacci, S.; Snaith, H. J.. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - 135:36(2013), pp. 13538-13548. [10.1021/ja406230f]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/565167
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