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Intrinsic Carrier Transport of Phase‐Pure Homologous 2D Organolead Halide Hybrid Perovskite Single Crystals
Author(s) -
Li MinKen,
Chen TzuPei,
Lin YenFu,
Raghavan Chinnambedu Murugesan,
Chen WeiLiang,
Yang ShihHsien,
Sankar Raman,
Luo ChihWei,
Chang YuMing,
Chen ChunWei
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201803763
Subject(s) - halide , perovskite (structure) , electron mobility , phase (matter) , materials science , homologous series , crystal (programming language) , chemical physics , electrical resistivity and conductivity , crystallography , analytical chemistry (journal) , chemistry , inorganic chemistry , optoelectronics , electrical engineering , organic chemistry , computer science , programming language , engineering , chromatography
This work reveals the intrinsic carrier transport behavior of 2D organolead halide perovskites based on phase‐pure homologous ( n = 1, 2, and 3) Ruddelsden–Popper perovskite (RPP) (BA) 2 (MA) n −1 Pb n I 3n+1 single crystals. The 2D perovskite field effect transistors with high‐quality exfoliated 2D perovskite bulk crystals are fabricated, and characteristic output and transfer curves are measured from individual single‐crystal flakes with various n values under different temperatures. Unipolar n‐type transport dominated the electrical properties of all these 2D RPP single crystals. The transport behavior of the 2D organolead halide hybrid perovskites exhibits a strong dependence on the n value and the mobility substantially increases as the ratio of the number of inorganic perovskite slabs per organic spacer increases. By extracting the effect of contact resistances, the corrected mobility values for n = 1, 2, and 3 are 2 × 10 −3 , 8.3 × 10 −2 , and 1.25 cm 2 V −1 s −1 at 77 K, respectively. Furthermore, by combining temperature‐dependent electrical transport and optical measurements, it is found that the origin of the carrier mobility dependence on the phase transition for 2D organolead halide perovskites is very different from that of their 3D counterparts. Our findings offer insight into fundamental carrier transport behavior of 2D organic–inorganic hybrid perovskites based on phase‐pure homologous single crystals.