Intrinsic Carrier Transport of Phase-Pure Homologous 2D Organolead Halide Hybrid Perovskite Single Crystals

Min-Ken Li; Tzu-Pei Chen; Yen-Fu Lin; Chinnambedu Murugesan Raghavan; Wei-Liang Chen; Shih-Hsien Yang; Raman Sankar; Chih-Wei Luo; Yu-Ming Chang; Chun-Wei Chen

doi:10.1002/smll.201803763

Intrinsic Carrier Transport of Phase-Pure Homologous 2D Organolead Halide Hybrid Perovskite Single Crystals

Small. 2018 Dec;14(52):e1803763. doi: 10.1002/smll.201803763. Epub 2018 Nov 14.

Authors

Min-Ken Li¹, Tzu-Pei Chen^{1

2

3}, Yen-Fu Lin⁴, Chinnambedu Murugesan Raghavan¹, Wei-Liang Chen⁵, Shih-Hsien Yang⁴, Raman Sankar^{5

6}, Chih-Wei Luo⁷, Yu-Ming Chang⁵, Chun-Wei Chen^{1

8

9}

Affiliations

¹ Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan.
² Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan.
³ Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan University, No. 128, Sec. 2, Academia Rd., Taipei, 115, Taiwan.
⁴ Department of Physics, National Chung Hsing University, No. 145, Xingda Rd., Taichung, 40227, Taiwan.
⁵ Center for Condensed Matter Sciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan.
⁶ Institute of Physics, Academia Sinica, No. 128, Sec. 2, Academia Rd., Taipei, 115, Taiwan.
⁷ Department of Electrophysics, National Chiao Tung University, No. 1001, University Rd., Hsinchu, 300, Taiwan.
⁸ Taiwan Consortium of Emergent Crystalline Materials (TCECM), Ministry of Science and Technology, Taipei, 106, Taiwan.
⁹ Center of Atomic Initiative for New Materials (AI-MAT), National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan.

PMID: 30430728
DOI: 10.1002/smll.201803763

Abstract

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 cm² 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.

Keywords: 2D RPP single crystals; field-effect transistors; intrinsic charge transport; photoluminescence; solution growth.

Abstract

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