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Surface molecular doping of all-inorganic perovskite using zethrenes molecules

Nano Research 2019年第1期12卷 77-84页

作者： Arramel Hu Pan Aozhen Xie Songyan Hou Xinmao Yin Chi Sin Tang Nguyen T.Hoa Muhammad D.Birowosuto Hong Wang Cuong Dang andrivo rusydi Andrew T.S.Wee Jishan Wu Department of Physics National University of Singapore2 Science Drive 3Singapore 117542Singapore Centre for Advanced 2D Materials National University of SingaporeBlock S14Level 66 Science Drive 2Singapore 117546Singapore Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore CINTRA UMICNRS/NTU/THALES 3288 Research Techno Plaza50 Nanyang DriveLevel 6Border X BlockSingapore 637553Singapore School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Energy Research Institute@NTU(ERI@N) Nanyang Technological UniversityResearch Techno PlazaX-Frontier BlockLevel 550 Nanyang DriveSingapore 637553Singapore Singapore Synchrotron Light Source National University of Singapore5 Research LinkSingapore 1176033Singapore NUS Graduate School for Integrative Sciences and Engineering(NGS) National University of SingaporeSingapore 117456Singapore NUSNNI-NanoCore National University of SingaporeSingapore 117411Singapore Institute of Materials Research&Engineering(IMRE) Agency far ScienceTechnology and Research(A^*STAR)2 Fusionopolis WayInnovisSingapore 138634Singapore

We present an optical and photoelectron spectroscopic study to elucidate the interfacial electronic properties of organic-inorganic semiconductor heterojunctions formed in a kinetically blocked heptazethrene triisopropylsilyl ethynylene (HZ-TIPS) and its homologue,octazethrene (OZ-TIPS) on an all-inorganic perovskite cesium lead bromide (CsPbBr3) *** photoluminescence behavior of the underlying perovskites upon differing molecular doping conditions was *** turns out that the charge transfer dynamics of thermally-evaporated OZ-TIPS molecule exhibited a faster average lifetime than that of the HZ-TIPS case suggesting the importance of the biradical state in the former *** interfacial dipole was formed at the interface due to the competing interaction between the dispersion force of the bulky TIPS-substituent group and the attractive van der Waals interaction at the first few *** spectroscopy of the physisorbed HZ-TIPS shows chemical shifts,which indicates electron transfer from HZ-TIPS molecules to the CsPbBr3 perovskite single *** contrast,the adsorbed OZ-TIPS molecular layer on CsPbBr3 demonstrates the opposite trend indicating a hole transfer *** average molecular orientation as determined by near edge X-ray absorption fine structure (NEXAFS) suggests that the HZ-TIPS molecular plane is generally lifted with respect to the perovskite *** suggest that the nature of the closed-shell electronic ground state of HZ-TIPS could contribute to the formation of interfacial dipole at the molecule/perovskite interface.

关键词： zethrene photoelectron spectroscopy perovskite near edge X-ray absorption fine structure and molecular doping

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