2017
DOI: 10.1103/physrevlett.119.116401
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Unexpected Large Hole Effective Masses in SnSe Revealed by Angle-Resolved Photoemission Spectroscopy

Abstract: SnSe has emerged as an efficient thermoelectric material since a high value of the thermoelectric figure of merit (ZT) has been reported recently. Here we show with systematic angle resolved photoemission spectroscopy data that the low-lying electronic structures of undoped and hole-doped SnSe crystals exhibit noticeable temperature variation from 80 to 600 K. In particular, the hole effective masses for the two lowest lying valence band maxima are found to be very large and increase with decreasing temperatur… Show more

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Cited by 51 publications
(28 citation statements)
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“…Note added. We have noticed that there are two other ARPES papers on p-SnSe published very recently 33 , 34 , during the revision of our work.…”
Section: Discussionmentioning
confidence: 89%
“…Note added. We have noticed that there are two other ARPES papers on p-SnSe published very recently 33 , 34 , during the revision of our work.…”
Section: Discussionmentioning
confidence: 89%
“…The significant thermoelectric performance also raised from high S 2 (~14.2 μW cm -1 K -2 ), which came from high (~149.5 S cm -1 ) and strongly enhanced S (~307.8 μV K -1 ) at 773 K [78]. By angle-resolved photoemission spectroscopy, large hole effective masses were revealed in both undoped and hole-doped SnSe crystals [243], contributing to the high electrical transport…”
Section: P-type Dopingmentioning
confidence: 98%
“…Tin selenide (SnSe) is a typical semiconductor with a narrow bandgap of ≈0.9 eV, making it a good candidate with great potentials for applications in low‐cost thermoelectrics . A remarkable high peak ZT of ≈2.6 at 923 K was reported in the p‐type SnSe single crystals, and a relative high ZT of ≈2.2 at 773 K was also achieved from the n‐type Bi‐doped SnSe single crystals, both along their b ‐axes.…”
Section: Introductionmentioning
confidence: 99%