Ultrafast Exciton Dissociation and Long-Lived Charge Separation in a Photovoltaic Pentacene–MoS2 van der Waals Heterojunction

Bettis Homan, Stephanie; Sangwan, Vinod K.; Balla, Itamar; Bergeron, Hadallia; Weiss, Emily A.; Hersam, Mark C.

doi:10.1021/acs.nanolett.6b03704

Title: Ultrafast Exciton Dissociation and Long-Lived Charge Separation in a Photovoltaic Pentacene–MoS₂ van der Waals Heterojunction

Journal Article · Mon Dec 05 00:00:00 EST 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.6b03704· OSTI ID:1388150

Bettis Homan, Stephanie ^[1]; Sangwan, Vinod K. ^[1];

^[1]; Bergeron, Hadallia ^[1]; Weiss, Emily A. ^[1];

^[1]

Northwestern Univ., Evanston, IL (United States)

van der Waals heterojunctions between two-dimensional (2D) layered materials and nanomaterials of different dimensions present unique opportunities for gate-tunable optoelectronic devices. Mixed-dimensional p–n heterojunction diodes, such as p-type pentacene (0D) and n-type monolayer MoS₂ (2D), are especially interesting for photovoltaic applications where the absorption cross-section and charge transfer processes can be tailored by rational selection from the vast library of organic molecules and 2D materials. In this work, we study the kinetics of excited carriers in pentacene–MoS₂ p–n type-II heterojunctions by transient absorption spectroscopy. These measurements show that the dissociation of MoS₂ excitons occurs by hole transfer to pentacene on the time scale of 6.7 ps. In addition, the charge-separated state lives for 5.1 ns, up to an order of magnitude longer than the recombination lifetimes from previously reported 2D material heterojunctions. By studying the fractional amplitudes of the MoS₂ decay processes, the hole transfer yield from MoS₂ to pentacene is found to be ~50%, with the remaining holes undergoing trapping due to surface defects. In general, the ultrafast charge transfer and long-lived charge-separated state in pentacene–MoS₂ p–n heterojunctions suggest significant promise for mixed-dimensional van der Waals heterostructures in photovoltaics, photodetectors, and related optoelectronic technologies.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001059; DMR-1121262

OSTI ID:: 1388150

Journal Information:: Nano Letters, Vol. 17, Issue 1; Related Information: ANSER partners with Northwestern University (lead); Argonne National Laboratory; University of Chicago; University of Illinois, Urbana-Champaign; Yale University; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 143 works

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Title: Ultrafast Exciton Dissociation and Long-Lived Charge Separation in a Photovoltaic Pentacene–MoS₂ van der Waals Heterojunction