Bulk photovoltaic effect and high mobility in the polar 2D semiconductor SnP 2 Se 6

Author:

Sangwan Vinod K.1ORCID,Chica Daniel G.2ORCID,Chu Ting-Ching3ORCID,Cheng Matthew1ORCID,Quintero Michael A.2,Hao Shiqiang1ORCID,Mead Christopher E.1ORCID,Choi Hyeonseon1ORCID,Zu Rui4ORCID,Sheoran Jyoti4,He Jingyang4,Liu Yukun1,Qian Eric2ORCID,Laing Craig C.2ORCID,Kang Min-A1ORCID,Gopalan Venkatraman4ORCID,Wolverton Chris1ORCID,Dravid Vinayak P.1ORCID,Lauhon Lincoln J.1ORCID,Hersam Mark C.125ORCID,Kanatzidis Mercouri G.2ORCID

Affiliation:

1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.

2. Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.

3. Applied Physics Graduate Program, Northwestern University, Evanston, IL 60208, USA.

4. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA.

5. Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA.

Abstract

The growth of layered 2D compounds is a key ingredient in finding new phenomena in quantum materials, optoelectronics, and energy conversion. Here, we report SnP 2 Se 6 , a van der Waals chiral ( R 3 space group) semiconductor with an indirect bandgap of 1.36 to 1.41 electron volts. Exfoliated SnP 2 Se 6 flakes are integrated into high-performance field-effect transistors with electron mobilities >100 cm 2 /Vs and on/off ratios >10 6 at room temperature. Upon excitation at a wavelength of 515.6 nanometer, SnP 2 Se 6 phototransistors show high gain (>4 × 10 4 ) at low intensity (≈10 −6 W/cm 2 ) and fast photoresponse (< 5 microsecond) with concurrent gain of ≈52.9 at high intensity (≈56.6 mW/cm 2 ) at a gate voltage of 60 V across 300-nm-thick SiO 2 dielectric layer. The combination of high carrier mobility and the non-centrosymmetric crystal structure results in a strong intrinsic bulk photovoltaic effect; under local excitation at normal incidence at 532 nm, short circuit currents exceed 8 mA/cm 2 at 20.6 W/cm 2 .

Publisher

American Association for the Advancement of Science (AAAS)

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