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Electronic and Optical Modulation of Metal-Doped Hybrid Organic-Inorganic Perovskites Crystals by Post-Treatment Control
Arramela, Xie A.c, Yin X.a, Tang C.S.a, Mahyuddin M.H.f, Hettiarachchi C.c, Sahdan M.F.a, Yoshizawa K.g, Dang C.c, Birowosuto M.D., Wee A.T.S.a, Rusydi A.a
a Department of Physics, National University of Singapore, 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 Research Group of Advanced Functional Materials, Faculty of Industrial Technology, Institut Teknologi Bandung, Bandung, 40132, Indonesia
g Institute for Materials Chemistry and Engineering, IRCCS, Kyushu University, Fukuoka, 819-0395, Japan
[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]Copyright © 2020 American Chemical Society.Recently, considerable interest in the fields of photovoltaics, light emission, and photodetection absorbers has centered on hybrid organic-inorganic perovskites (HOIPs). Here, we report a combined photoluminescence and high-resolution photoemission study to investigate the defect-site passivation of the B-site methylammonium lead bromide perovskites (B site = In3+, Sr2+, and Li+). A distinctive behavior of the optical response is revealed by means of temperature-dependent time-resolved photoluminescence (TR-PL) measurements. Upon mild argon treatment, the initial thermal quenching rate with respect to the radiative transition rate (Δ0/Δv) ratio and thermal quenching activation energy (ΔEq) of Sr-doped MAPbBr3 is reduced by an order of magnitude. The average charge carrier lifetime (τave) of Sr-doped MAPbBr3 after treatment is significantly improved from 36 to 77 ns, respectively. Moreover, the occupied state of metal-doped MAPbBr3 probed by ultraviolet photoemission spectroscopy (UPS) indicates tunable charge transfer based on rational chemical design. Supported by density functional theory, small band gap changes are observed across Sr-, In-, and Li-doped cases. This work improves our understanding of the photophysics of HOIPs with the possible future aim of improving the stability of emergent perovskite materials by post-treatment control.[/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]Chemical designs,High-resolution photoemission,Hybrid organic-inorganic,Radiative transition rate,Temperature dependent,Thermal quenching,Time-resolved photoluminescence,Ultraviolet 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]argon treatment,charge carrier dynamics,exciton,methylammonium lead bromide perovskites,ultraviolet photoelectron 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=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]We acknowledge Wong How Kwong for his assistance during photoemission measurements. Xiaojiang Yu is appreciated for his technical support at the Singapore Synchrotron Light Source (SSLS). We declare that synchrotron facility plays indispensable part in this work as a National Research Infrastructure under the National Research Foundation Singapore. This work is financially supported by several funding agencies. Authors acknowledge a research grant from the MOE Tier 3 Programme (MOE2014-T3-1-004) and MOE Tier 2 Programme (MOE2018-T2-1-088). The work at SSLS is supported by 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 funding from the Ministry of Education (MOE2016-T2-1-052). The theoretical computations were performed at the Research Institute for Information Technology of Kyushu University. M.H.M. acknowledges a research fund from the Institut Teknologi Bandung through the “Program Penelitian, Pengabdian kepada Masyarakat, dan Inovasi (P3MI)” Program.[/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/10.1021/acsaem.0c00916[/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]