Band-like Charge Photogeneration at a Crystalline Organic Donor/Acceptor Interface

Fusella, Michael A.; Brigeman, Alyssa N.; Welborn, Matthew; Purdum, Geoffrey E.; Yan, Yixin; Schaller, Richard D.; Lin, YunHui L.; Loo, Yueh-Lin; Voorhis, Troy Van; Giebink, Noel C.; Rand, Barry P.

doi:10.1002/aenm.201701494

Title: Band-like Charge Photogeneration at a Crystalline Organic Donor/Acceptor Interface

Journal Article · Fri Dec 08 00:00:00 EST 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201701494· OSTI ID:1470430

Fusella, Michael A. ^[1]; Brigeman, Alyssa N. ^[1]; Welborn, Matthew ^[2]; Purdum, Geoffrey E. ^[3]; Yan, Yixin ^[1]; Schaller, Richard D. ^[4]; Lin, YunHui L. ^[1]; Loo, Yueh-Lin ^[5]; Voorhis, Troy Van ^[2]; Giebink, Noel C. ^[1];

^[5]

Princeton Univ., NJ (United States). Dept. of Electrical Engineering
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry
Princeton Univ., NJ (United States). Dept. of Chemical and Biological Engineering
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Princeton Univ., NJ (United States). Dept. of Electrical Engineering, Andlinger Center for Energy and the Environment

Organic photovoltaic cells possess desirable practical characteristics, such as the potential for low-cost fabrication on flexible substrates, but they lag behind their inorganic counterparts in performance due in part to fundamental energy loss mechanisms, such as overcoming the charge transfer (CT) state binding energy when photogenerated charge is transferred across the donor/acceptor interface. However, recent work has suggested that crystalline interfaces can reduce this binding energy due to enhanced CT state delocalization. Solar cells based on rubrene and C₆₀ are investigated as an archetypal system because it allows the degree of crystallinity to be moldulated from a highly disordered to highly ordered system. Using a postdeposition annealing method to transform as-deposited amorphous rubrene thin films into ones that are highly crystalline, it is shown that the CT state of a highly crystalline rubrene/C₆₀ heterojunction undergoes extreme delocalization parallel to the interface leading to a band-like state that exhibits a linear Stark effect. This state parallels the direct charge formation of inorganic solar cells and reduces energetic losses by 220 meV compared with 12 other archetypal heterojunctions reported in the literature.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE); Princeton Univ., NJ (United States); Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Department of Defense (DoD); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: SC0001088; SC0012458; SC0012365; DMR‐1332208; DMR‐1420541; AC02‐06CH11357

OSTI ID:: 1470430

Alternate ID(s):: OSTI ID: 1412584; OSTI ID: 1595406

Journal Information:: Advanced Energy Materials, Vol. 8, Issue 9; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Related Subjects

14 SOLAR ENERGY
42 ENGINEERING
solar (photovoltaic)
solid state lighting
photosynthesis (natural and artificial)
charge transport
optics
synthesis (novel materials)
synthesis (self-assembly)
synthesis (scalable processing)
charge transfer state
crystal
delocalized
rubrene
solar cells

Title: Band-like Charge Photogeneration at a Crystalline Organic Donor/Acceptor Interface

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