TY - JOUR
T1 - Enhanced Photoresponsivity of Fullerene in the Presence of Phthalocyanine
T2 - A Time-Resolved X-ray Photoelectron Spectroscopy Study of Phthalocyanine/C 60 /TiO 2 (110)
AU - Ozawa, Kenichi
AU - Yamamoto, Susumu
AU - D'Angelo, Marie
AU - Natsui, Yuto
AU - Terashima, Naoya
AU - Mase, Kazuhiko
AU - Matsuda, Iwao
N1 - Funding Information:
This work was supported by Grants-in-Aid for Scientific Research (Grant nos. 16H03867 and 16H06027) from MEXT, Japan. The photoelectron measurements at the Photon Factory were performed under the approval of the Photon Factory Advisory Committee (Proposal nos. 2016G529 and 2017G525). The TRXPS study at BL07LSU of SPring-8 was conducted using the facilities of the Synchrotron Radiation Research Organization, The University of Tokyo (Proposal nos. 2016A7503 and 2017A7533).
PY - 2019/2/21
Y1 - 2019/2/21
N2 - Time-resolved soft X-ray photoelectron spectroscopy has been utilized to reveal a time evolution of excitation states of metal and metaloxo phthalocyanine (MPc; M = Cu and TiO) and fullerene (C 60 ) in the ultrathin layered MPc/C 60 /TiO 2 (110) systems. C 1s core-level photoemission peaks of MPc and C 60 were monitored to assess spontaneous changes induced by ultraviolet laser. The C 1s peaks of both species move toward higher binding energies, reflecting cationization of the molecules as a result of dissociation of photoexcited excitons followed by electron transfer from the molecules to TiO 2 . The magnitude of the C 60 C 1s peak shift is as large as 13-14 meV, whereas the shift of only 7 meV is induced when phthalocyanine-free C 60 /TiO 2 (110) is excited. Photoresponsivity of C 60 is enhanced when C 60 coexists with the phthalocyanine molecules. An efficient energy transfer from photoexcited MPc to C 60 and a resultant exciton formation in C 60 are responsible for this enhancement.
AB - Time-resolved soft X-ray photoelectron spectroscopy has been utilized to reveal a time evolution of excitation states of metal and metaloxo phthalocyanine (MPc; M = Cu and TiO) and fullerene (C 60 ) in the ultrathin layered MPc/C 60 /TiO 2 (110) systems. C 1s core-level photoemission peaks of MPc and C 60 were monitored to assess spontaneous changes induced by ultraviolet laser. The C 1s peaks of both species move toward higher binding energies, reflecting cationization of the molecules as a result of dissociation of photoexcited excitons followed by electron transfer from the molecules to TiO 2 . The magnitude of the C 60 C 1s peak shift is as large as 13-14 meV, whereas the shift of only 7 meV is induced when phthalocyanine-free C 60 /TiO 2 (110) is excited. Photoresponsivity of C 60 is enhanced when C 60 coexists with the phthalocyanine molecules. An efficient energy transfer from photoexcited MPc to C 60 and a resultant exciton formation in C 60 are responsible for this enhancement.
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U2 - 10.1021/acs.jpcc.9b00186
DO - 10.1021/acs.jpcc.9b00186
M3 - Article
AN - SCOPUS:85062226245
VL - 123
SP - 4388
EP - 4395
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 7
ER -