Low‐Temperature Deposition of Layered SnSe2 for Heterojunction Diodes

​"Martha I. Serna, Syed M. N. Hasan, S. Nam, Lidia El Bouanani, Salvador Moreno, Hyunjoo Choi, Husam N. Alshareef, Majid Minary-Jolandan, Manuel A. Quevedo‐Lopez" Low‐Temperature Deposition of Layered SnSe2 for Heterojunction Diodes
​Adv. Mater. Interfaces 2018, 5, 1800128,​
Martha I. Serna, Syed M. N. Hasan, S. Nam, Lidia El Bouanani, Salvador Moreno, Hyunjoo Choi, Husam N. Alshareef, Majid Minary-Jolandan, Manuel A. Quevedo‐Lopez
layered metal dichalcogenides, metal dichalcogenide diodes, pulsed laser deposition, SnSe2 thin films
​Tin diselenide (SnSe2) has been recently investigated as an alternative layered metal dichalcogenide due to its unique electrical and optoelectronics properties. Although there are several reports on the deposition of layered crystalline SnSe2 films by chemical and physical methods, synthesis methods like pulsed laser deposition (PLD) are not reported. An attractive feature of PLD is that it can be used to grow 2D films over large areas. In this report, a deposition process to grow stoichiometric SnSe2 on different substrates such as single crystals (Sapphire) and amorphous oxides (SiO2 and HfO2) is reported. A detailed process flow for the growth of 2D SnSe2 at temperatures of 300 °C is presented, which is substantially lower than temperatures used in chemical vapor deposition and molecular beam epitaxy. The 2D SnSe2 films exhibit a mobility of ≈4.0 cm2 V−1 s−1, and are successfully used to demonstrate SnSe2/p‐Si heterojunction diodes. The diodes show I on/I off ratios of 103–104 with a turn on voltage of <0.5 V, and ideality factors of 1.2–1.4, depending on the SnSe2 film growth conditions.