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Molecular functionalization of all-inorganic perovskite CsPbBr3thin films
Arramela, Hu P.a, Xie A.b,c, Yin X.a, Tang C.S.a, Ikeda K.f, Mahyuddin M.H.g, Sahdan M.F.a, Wang D.a, Yoshizawa K.f, Wang H.b,c, Birowosuto M.D.b, Dang C.b,c, Rusydi A.a, Wee A.T.S.a, Wu J.a
a Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore
b CINTRA UMI CNRS/NTU/THALES, Singapore, 637553, Singapore
c School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore
d Energy Research Institute @NTU (ERI@N), Nanyang Technological University, Singapore, 637553, Singapore
e NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore
f Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Fukuoka, 819-0395, Japan
g Research Group of Advanced Functional Materials, Institut Teknologi Bandung, Bandung,, 40132, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© The Royal Society of Chemistry 2020.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.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Charge carrier dynamics,Charge-transfer dynamics,Conjugated organic materials,Electronic interactions,First-principles calculation,High-resolution photoemission,Molecular functionalization,Resonant photoemission spectroscopy[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]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).[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1039/d0tc02642e[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]