Ag-In-Zn-S quantum dots for hybrid organic-inorganic solar cells

作者：Kim Eung min; Ruankham Pipat; Lee Jae hyeong; Hachiya Kan; Sagawa Takashi

来源：Japanese Journal of Applied Physics, 2016, 55(2): 02BF06.

DOI：10.7567/JJAP.55.02BF06

Quantum dots of (AgIn)(x)Zn2(1-x)S2 (x = 0.6, 0.8, and 1.0) capped by oleylamine were prepared and applied for hybrid organic-inorganic solar cells consisting of glass-indium-tin-oxide/ZnO/(AgIn)(x)Zn2(1-x)S2/poly(3-hexylthiophene)/MoO3/Ag. The short-circuit current density (J(sc)) and open-circuit voltage (V-oc) of the hybrid solar cells were measured, and we found a low power conversion efficiency (PCE) below 0.1%. From the incident photon-to-current efficiency (IPCE) profiles of the hybrid devices, there is no marked photocurrent generation from 350 to 700 nm, which is ascribed to the absorption region of (AgIn)(x)Zn2(1-x)S2. To improve the photovoltaic performance, ligand substitution from oleylamine to pyridine was performed. The PCE of the hybrid cell using the pyridine-capped (AgIn)(x)Zn2(1-x)S2 was improved twofold in terms of both J(sc) and V-oc as compared with that of the oleylamine-capped one. In particular, from the IPCE measurements, a remarkable (more than doubled) enhancement of photocurrent generation from 400 to 450nm was observed with the pyridine-substituted nanoparticles.

• 出版日期2016-2