Facile surfactant-free synthesis of p-type SnSe nanoplates with exceptional thermoelectric power factors
- Han, Guang
- Popuri, Srinivas R.
- Greer, Heather F.
- Bos, Jan-Willem G.
- Zhou, Wuzong
- Knox, Andrew R.
- Montecucco, Andrea
- Siviter, Jonathan
- Man, Elena A.
- Macauley, Martin
- Paul, Douglas J.
- Li, Wen-guang
- Paul, Manosh C.
- Gao, Min
- Sweet, Tracy
- Freer, Robert
- Azough, Feridoon
- Baig, Hasan
- Sellami, Nazmi
- Mallick, Tapas K.
- Gregory, Duncan H.
DOIAbstract
A surfactant-free solution methodology, simply using water as a solvent, has been developed for the straightforward synthesis of single-phase orthorhombic SnSe nanoplates in gram quantities. Individual nanoplates are composed of {100} surfaces with {011} edge facets. Hot-pressed nanostructured compacts (Eg≈0.85 eV) exhibit excellent electrical conductivity and thermoelectric power factors (S2σ) at 550 K. S2σ values are 8-fold higher than equivalent materials prepared using citric acid as a structure-directing agent, and electrical properties are comparable to the best-performing, extrinsically doped p-type polycrystalline tin selenides. The method offers an energy-efficient, rapid route to p-type SnSe nanostructures
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