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- 저자 : Cojocaru-Miré (검색결과 1 건)
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Zhou, Chongjian,Yu, Yuan,Lee, Yong Kyu,Cojocaru-Miré,din, Oana,Yoo, Byeongjun,Cho, Sung-Pyo,Im, Jino,Wuttig, Matthias,Hyeon, Taeghwan,Chung, In American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.45
<P>From a structural and economic perspective, tellurium-free PbSe can be an attractive alternative to its more expensive isostructural analogue of PbTe for intermediate temperature power generation. Here we report that PbSe<SUB>0.998</SUB>Br<SUB>0.002</SUB>-2%Cu<SUB>2</SUB>Se exhibits record high peak <I>ZT</I> 1.8 at 723 K and average <I>ZT</I> 1.1 between 300 and 823 K to date for all previously reported n- and p-type PbSe-based materials as well as tellurium-free n-type polycrystalline materials. These even rival the highest reported values for n-type PbTe-based materials. Cu<SUB>2</SUB>Se doping not only enhance charge transport properties but also depress thermal conductivity of n-type PbSe. It flattens the edge of the conduction band of PbSe, increases the effective mass of charge carriers, and enlarges the energy band gap, which collectively improve the Seebeck coefficient markedly. This is the first example of manipulating the electronic conduction band to enhance the thermoelectric properties of n-type PbSe. Concurrently, Cu<SUB>2</SUB>Se increases the carrier concentration with nearly no loss in carrier mobility, even increasing the electrical conductivity above ∼423 K. The resulting power factor is ultrahigh, reaching ∼21-26 μW cm<SUP>-1</SUP> K<SUP>-2</SUP> over a wide range of temperature from ∼423 to 723 K. Cu<SUB>2</SUB>Se doping substantially reduces the lattice thermal conductivity to ∼0.4 W m<SUP>-1</SUP> K<SUP>-1</SUP> at 773 K, approaching its theoretical amorphous limit. According to first-principles calculations, the achieved ultralow value can be attributed to remarkable acoustic phonon softening at the low-frequency region.</P> [FIG OMISSION]</BR>
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