材料科学
捷克先令
热电效应
薄膜
微晶
带隙
分析化学(期刊)
功勋
化学气相沉积
塞贝克系数
退火(玻璃)
费米能级
光电子学
纳米技术
热导率
复合材料
冶金
热力学
电子
量子力学
色谱法
化学
物理
作者
Yu Liu,Paul D. McNaughter,Xiaodong Liu,Andrey V. Kretinin,Jonathan M. Skelton,Feridoon Azough,David J. Lewis,Robert Freer
标识
DOI:10.1021/acsami.3c17730
摘要
High-quality Cu2(Zn,Fe,Cd)SnS4 (CZFCTS) thin films based on the parent CZTS were prepared by aerosol-assisted chemical vapor deposition (AACVD). Substitution of Zn by Fe and Cd significantly improved the electrical transport properties, and monophasic CZFCTS thin films exhibited a maximum power factor (PF) of ∼0.22 μW cm–1 K–2 at 575 K. The quality and performance of the CZFCTS thin films were further improved by postdeposition annealing. CZFCTS thin films annealed for 24 h showed a significantly enhanced maximum PF of ∼2.4 μW cm–1 K–2 at 575 K. This is higher than all reported values for single-phase quaternary sulfide (Cu2BSnS4, B = Mn, Fe, Co, Ni) thin films and even exceeds the PF for most polycrystalline bulk materials of these sulfides. Density functional theory (DFT) calculations were performed to understand the impact of Cd and Fe substitution on the electronic properties of CZTS. It was predicted that CZFCTS would have a smaller band gap than CZTS and a higher density of states (DoS) near the Fermi level. The thermal conductivity and thermoelectric figure of merit (zT) of the CZFCTS thin films have been evaluated, yielding an estimated maximum zT range of 0.18–0.69 at 550 K. The simple processing route and improved thermoelectric performance make CZFCTS thin films extremely promising for thermoelectric energy generation.
科研通智能强力驱动
Strongly Powered by AbleSci AI