Lead tin sulfide (Pb_1−xSn_xS) nanocrystals: A potential solar absorber material

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• 作者：Yen-Chen Zeng^a ; Sheng-Fong Sie^a ; Nipapon Suriyawong^a ; Belete Asefa Aragaw^a ; Jen-Bin Shi^b ; Ming-Way Lee^a ; ^{mwl@phys.nchu.edu.tw}
• 关键词：Lead tin sulfide ; Solar cell ; Quantum dot ; Successive ionic layer adsorption and reaction ; Liquid junction
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：488
• 期：Complete
• 页码：246-250
• 全文大小：1588 K
• 卷排序：488

文摘

We present a new ternary semiconductor absorber material – Pb1−xSnxS – for solar cells. Pb1−xSnxS nanocrystals (NCs) were synthesized using the successive ionic layer adsorption reaction (SILAR) process. Energy-dispersive X-ray spectroscopy revealed the Sn ratio for a sample prepared with five SILAR cycles to be x = 0.55 (i.e. non-stoichiometric formula Pb0.45Sn0.55S). The optical spectra revealed that the energy gap Eg of the Pb1−xSnxS NCs decreased with an increasing number of SILAR cycles n, with Eg = 1.67 eV for the sample with n = 5. Liquid-junction Pb1−xSnxS quantum dot-sensitized solar cells were fabricated using the polysulfide electrolyte. The best cell yielded a short-circuit current density Jsc of 10.1 mA/cm2, an open circuit voltage of 0.43 V, a fill factor FF of 50% and an efficiency of 2.17% under 1 sun. The external quantum efficiency spectrum (EQE) covered a spectral range of 300–800 nm with a maximum EQE of ∼67% at λ = 650 nm. At the reduced light of 0.1 sun, the efficiency increased to 3.31% (with a normalized Jsc = 17.7 mA/cm2) – a respectable efficiency for a new sensitizer. This work demonstrates that Pb1−xSnxS shows potential as a solar cell absorber.