Eco-Friendly NaSbS2 Quantum Dot-Sensitized Solar Cells

• Published in: IEEE journal of photovoltaics Vol. 8; no. 4; pp. 1011 - 1016
• Main Authors: Sun, Wei-Chi, Rahayu, Siti Utari, Lee, Ming-Way
• Format: Journal Article
• Language: English
• Published: IEEE 01-07-2018
• Subjects: Adsorption; Nanofabrication; Nanoparticles; NaSbS<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _2</tex-math> </inline-formula> </named-content>; Photoconductivity; Photovoltaic cells; quantum dot (QD); Quantum dots; sensitizer; Short-circuit currents; sodium antimony sulfide; solar cell; solid state
• ISSN: 2156-3381
• DOI: 10.1109/JPHOTOV.2018.2826044

Ternary sulfide NaSbS2 is a low-cost, environmentfriendly semiconductor that has rarely been studied. This paper demonstrates, for the first time, solid-state NaSbS2 quantum dot-sensitized solar cells (QDSSCs). NaSbS 2 nanoparticles were synthesized using the sequential ionic layer adsorption reaction method. Solid-state QDSSCs were fabricated from the synthesized nanoparticles using spiro-OMeTAD as the hole-transporting electrolyte. The best cell yielded an efficiency of 1.27% under 1 sun. At the reduced light intensity I0 of 10% sun, the efficiency increased significantly to 4.11% with an open-circuit voltage Voc of 0.51 V, a short-circuit current density J sc of 1.68 mA/cm 2 , and a fill factor (FF) of 47.8%. A sublinear power law of J sc ∝ I 0 0.52 accounts for the large improvement in performance under low-light intensities because of the reduced carrier recombination. The external quantum efficiency (EQE) spectrum covered the spectral region of 300-750 nm with a maximum EQE value of 72% at λ = 450 nm. The present efficiency (4.11%) represents about 30% improvement over the best previous result (3.18%) of liquid-junction QDSSCs. The respectable efficiency indicates that NaSbS2 shows potential as an efficient solar absorber material.