TY - JOUR
T1 - Molecular functionalization of all-inorganic perovskite CsPbBr3thin films
AU - Arramel,
AU - Hu, Pan
AU - Xie, Aozhen
AU - Yin, Xinmao
AU - Tang, Chi Sin
AU - Ikeda, Kei
AU - Mahyuddin, Muhammad Haris
AU - Sahdan, Muhammad Fauzi
AU - Wang, Dingguan
AU - Yoshizawa, Kazunari
AU - Wang, Hong
AU - Birowosuto, Muhammad Danang
AU - Dang, Cuong
AU - Rusydi, Andrivo
AU - Wee, Andrew Thye Shen
AU - Wu, Jishan
N1 - Funding Information:
We acknowledge Wong How Kwong for his assistance during the UPS measurements. Xiaojiang Yu is appreciated for his technical support in the Singapore Synchrotron Light Source (SSLS). The authors acknowledge the Singapore Synchrotron Light Source (SSLS) for providing the facility necessary for conducting the research. The Laboratory is a National Research Infrastructure under the National Research Foundation Singapore. This work was financially supported by several funding agencies. Thus, the authors acknowledge the research grant from the MOE Tier 3 programme (MOE2014-T3-1-004). The work at SSLS was supported by the Singapore National Research Foundation under its Competitive Research Funding (NRF-CRP 8-2011-06), MOE-AcRF Tier-2 (MOE2015-T2-1-099), FRC and PHC Merlion. NTU authors acknowledge the Ministry of Education funding (MOE2016-T2-1-052).
PY - 2020/9/28
Y1 - 2020/9/28
N2 - Well-defined heterointerface formation between low bandgap π-conjugated organic materials and all-inorganic perovskites is desirable for the advancement of physical, chemical, and electronic interactions in solar-cell devices. Herein, we investigate the charge carrier dynamics and optical responses across three representative functionalized-heptazetherene molecules on CsPbBr3thin films using synchrotron high-resolution photoemission techniques, namely, X-ray photoemission spectroscopy, X-ray absorption spectroscopy, resonant photoemission spectroscopy and photoluminescence spectroscopy. Chemical substitution on the heptazethrene backbone results in tunable formation of interfacial dipoles at the heptazethrene/CsPbBr3interfaces. Charge transfer across these interfaces is enhanced by the presence of highly electronegative fluorine atoms or electron-donating alkyl-based chain groups in the molecular periphery. Resonant valence spectra near the K-edge threshold indicate that the core-decay participator channel contributes to the charge transfer dynamics with an average charge transfer time of ∼12 fs. First-principles calculations indicated that the charge transfer across the molecule/perovskite interfaces can be modulatedviachemical design. In addition, we observe that the photoluminesence quenching of the perovskite and the molecule signals can be attributed to the efficent energy transfer across the interface. This work systematically addresses the potential of functionalized-zethrene molecules as active materials for ultra-thin hybrid solar cell devices.
AB - Well-defined heterointerface formation between low bandgap π-conjugated organic materials and all-inorganic perovskites is desirable for the advancement of physical, chemical, and electronic interactions in solar-cell devices. Herein, we investigate the charge carrier dynamics and optical responses across three representative functionalized-heptazetherene molecules on CsPbBr3thin films using synchrotron high-resolution photoemission techniques, namely, X-ray photoemission spectroscopy, X-ray absorption spectroscopy, resonant photoemission spectroscopy and photoluminescence spectroscopy. Chemical substitution on the heptazethrene backbone results in tunable formation of interfacial dipoles at the heptazethrene/CsPbBr3interfaces. Charge transfer across these interfaces is enhanced by the presence of highly electronegative fluorine atoms or electron-donating alkyl-based chain groups in the molecular periphery. Resonant valence spectra near the K-edge threshold indicate that the core-decay participator channel contributes to the charge transfer dynamics with an average charge transfer time of ∼12 fs. First-principles calculations indicated that the charge transfer across the molecule/perovskite interfaces can be modulatedviachemical design. In addition, we observe that the photoluminesence quenching of the perovskite and the molecule signals can be attributed to the efficent energy transfer across the interface. This work systematically addresses the potential of functionalized-zethrene molecules as active materials for ultra-thin hybrid solar cell devices.
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U2 - 10.1039/d0tc02642e
DO - 10.1039/d0tc02642e
M3 - Article
AN - SCOPUS:85091862283
VL - 8
SP - 12587
EP - 12598
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
SN - 2050-7526
IS - 36
ER -