Efficient charge generation from triplet excitons in metal-organic heterojunctions

Roth, Friedrich; Neppl, Stefan; Shavorskiy, Andrey; Arion, Tiberiu; Mahl, Johannes; Seo, Hyun Ook; Bluhm, Hendrik; Hussain, Zahid; Gessner, Oliver; Eberhardt, Wolfgang

doi:10.1103/physrevb.99.020303

Title: Efficient charge generation from triplet excitons in metal-organic heterojunctions

Journal Article · Mon Jan 07 00:00:00 EST 2019 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.99.020303· OSTI ID:1845091

Roth, Friedrich ^[1]; Neppl, Stefan ^[2]; Shavorskiy, Andrey ^[2]; Arion, Tiberiu ^[3]; Mahl, Johannes ^[2]; Seo, Hyun Ook ^[3]; Bluhm, Hendrik ^[2]; Hussain, Zahid ^[4]; Gessner, Oliver ^[2]; Eberhardt, Wolfgang ^[5]

Technical Univ. of Freiberg (Germany); Institute for Experimental Physics, Freiberg (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Technical Univ. of Berlin (Germany)

The success of many emerging molecular electronics concepts hinges on an atomistic understanding of the underlying electronic dynamics. We employ picosecond time-resolved x-ray photoemission spectroscopy (tr-XPS) to elucidate the roles of singlet and triplet excitons for photoinduced charge generation at a copper-phthalocyanine-C₆₀ heterojunction. Contrary to common belief, fast intersystem crossing to triplet excitons after photoexcitation is not a loss channel but contributes to a significantly larger extent to the time-integrated interfacial charge generation than the initially excited singlet excitons. The tr-XPS data provide direct access to the diffusivity of the triplet excitons D_CuPc=(1.8±1.2)×10^-5cm²/s (where CuPc is copper-phthalocyanine) and their diffusion length L_diff=(8±3)nm.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1845091

Alternate ID(s):: OSTI ID: 1489842

Journal Information:: Physical Review. B, Vol. 99, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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