Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan.
Nanoscale. 2012 Feb 21;4(4):1368-72. doi: 10.1039/c2nr11705c. Epub 2012 Jan 26.
Pronounced absorption in the visible-NIR range of 400-1300 nm is demonstrated in the Ag(2)S nanoparticles (NPs)/ZnO nanowire (NW) array. ZnO NW arrays are grown on indium tin oxide substrates using chemical bath deposition. The Ag(2)S NPs are sequentially formed on the ZnO NWs through sonochemical synthesis. Structural characterizations indicate the slight deconstruction of surface of ZnO NWs during Ag(2)S NPs formation. By employing polysulfide electrolyte, short-circuit current (J(sc)), open-circuit voltage and therefore the efficiency of the Ag(2)S NP-sensitized ZnO NW solar cell are improved with increasing the initial sulfur concentration in the sulfur-polysulfide electrolyte. The Ag(2)S NP-sensitized ZnO NW solar cell shows a conversion efficiency of 0.49% with a superior J(sc) of ~13.7 mA cm(-2) under AM 1.5 illumination at 100 mW cm(-2). Incident photon conversion efficiency measurements reveal that Ag(2)S NPs contribute to 33.4% and 65.2% of J(sc) in the wavelength ranges of 400-700 nm and 700-1300 nm, respectively.
Ag(2)S 纳米颗粒（NPs）/ZnO 纳米线（NW）阵列在可见-近红外范围 400-1300nm 处表现出明显的吸收。通过化学浴沉积在铟锡氧化物衬底上生长 ZnO NW 阵列。通过超声化学合成，Ag(2)S NPs 依次形成在 ZnO NW 上。结构表征表明，在 Ag(2)S NPs 形成过程中，ZnO NW 表面略有解构。通过采用多硫化物电解质，随着初始硫浓度在硫-多硫化物电解质中的增加，Ag(2)S NP 敏化 ZnO NW 太阳能电池的短路电流（J(sc)）、开路电压和效率得到提高。Ag(2)S NP 敏化 ZnO NW 太阳能电池在 AM 1.5 光照下，在 100 mW cm(-2)下的转换效率为 0.49%，短路电流约为 13.7 mA cm(-2)。入射光子转换效率测量表明，Ag(2)S NPs 在波长范围 400-700nm 和 700-1300nm 处分别贡献了 J(sc)的 33.4%和 65.2%。
