title: Synthesis and characterization of Ag2SxSe1-xnanocrystals and their photoelectrochemical property.
abstract: I-VI chalcogenide low-toxicity semiconductors and their near-infrared optical property are of great importance for solar cell and biological probe applications. Here, we report the synthesis of Ag2SxSe1-x(x = 0-1) ternary nanocrystals (NCs) and their photoelectrochemical properties, using a refined simple hot-injection reaction recipe. The ICP-MS results show the change of non-metallic composition in products and precursors, which can be well fitted with Vegard's equation. Ternary alloying broadens the absorption spectrum region of Ag2S NCs. It can also balance the transfer of photo-excited electrons through the interfaces of TiO2/Ag2SxSe1-xand Ag2SxSe1-x/electrolyte by minimizing electron-hole recombination. By tuning the compositions, an increase in power conversion efficiency (PCE) was observed with the increase of S composition and the size of the NCs. The photoelectrochemical results reveal that Ag2SxSe1-xternary NCs exhibit higher conversion efficiency than pure binary NCs. The drop in PCE of the binary NCs is mainly attributed to the decreases of the charge separation following exciton transition.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Changyin
authors.initials: C
authors.lastname: Ji
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Zhang
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Shen
authors.forename: Wenzhu
authors.initials: W
authors.lastname: Gao
authors.forename: Yiding
authors.initials: Y
authors.lastname: Wang
authors.forename: William W
authors.initials: WW
authors.lastname: Yu