TY - JOUR
T1 - Influence of Stacking Order of Phthalocyanine and Fullerene Layers on the Photoexcited Carrier Dynamics in Model Organic Solar Cell
AU - Ozawa, Kenichi
AU - Yamamoto, Susumu
AU - Miyazawa, Tetsuya
AU - Yano, Keita
AU - Okudaira, Koji
AU - Mase, Kazuhiko
AU - Matsuda, Iwao
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (grant nos. 16H03867 and 16H06027) from MEXT, Japan. The photoemission measurements at the Photon Factory were performed under the approval of the Photon Factory Advisory Committee (proposal nos. 2016G529, 2017G525, and 2018S2-005). 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, 2017A7533, 2017B7542, and 2018B7589).
Publisher Copyright:
© 2021 American Chemical Society
PY - 2021/7/1
Y1 - 2021/7/1
N2 - Metal phthalocyanine and fullerene are typical p-type and n-type organic semiconductors and are often used as constituents of model systems of organic photovoltaics (OPVs). The light-electricity conversion efficiency of the OPVs is influenced by many factors, and a composite structure is one of them. In the present study, time-resolved X-ray photoelectron spectroscopy has been utilized to examine the influence of the stacking order of copper phthalocyanine (CuPc) and fullerene (C60) on photoexcited carrier dynamics in layered CuPc-C60thin-film OPVs fabricated on a rutile TiO2(110) substrate. TiO2is a strong n-type semiconductor and is found to serve as an electron acceptor, which collects the excited electrons in both CuPc and C60layers irrespective of their stacking order. However, a clear difference is found in the electron transfer from C60to TiO2in short delay times below 1 ns; an electron transfer is facilitated in CuPc/C60/TiO2stacking, whereas the fast electron transfer is suppressed in C60/CuPc/TiO2stacking. The insertion of the CuPc layer between C60and TiO2is effective to block the C60→ TiO2electron transfer even though the CuPc layer has a monolayer thickness.
AB - Metal phthalocyanine and fullerene are typical p-type and n-type organic semiconductors and are often used as constituents of model systems of organic photovoltaics (OPVs). The light-electricity conversion efficiency of the OPVs is influenced by many factors, and a composite structure is one of them. In the present study, time-resolved X-ray photoelectron spectroscopy has been utilized to examine the influence of the stacking order of copper phthalocyanine (CuPc) and fullerene (C60) on photoexcited carrier dynamics in layered CuPc-C60thin-film OPVs fabricated on a rutile TiO2(110) substrate. TiO2is a strong n-type semiconductor and is found to serve as an electron acceptor, which collects the excited electrons in both CuPc and C60layers irrespective of their stacking order. However, a clear difference is found in the electron transfer from C60to TiO2in short delay times below 1 ns; an electron transfer is facilitated in CuPc/C60/TiO2stacking, whereas the fast electron transfer is suppressed in C60/CuPc/TiO2stacking. The insertion of the CuPc layer between C60and TiO2is effective to block the C60→ TiO2electron transfer even though the CuPc layer has a monolayer thickness.
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U2 - 10.1021/acs.jpcc.1c03584
DO - 10.1021/acs.jpcc.1c03584
M3 - Article
AN - SCOPUS:85110532635
VL - 125
SP - 13963
EP - 13970
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 25
ER -