title: Aqueous-Processed Inorganic Thin-Film Solar Cells Based on CdSe(x)Te(1-x) Nanocrystals: The Impact of Composition on Photovoltaic Performance.
abstract: Aqueous processed nanocrystal (NC) solar cells are attractive due to their environmental friendliness and cost effectiveness. Controlling the bandgap of absorbing layers is critical for achieving high efficiency for single and multijunction solar cells. Herein, we tune the bandgap of CdTe through the incorporation of Se via aqueous process. The photovoltaic performance of aqueous CdSexTe1-x NCs is systematically investigated, and the impacts of charge generation, transport, and injection on device performance for different compositions are deeply discussed. We discover that the performance degrades with the increasing Se content from CdTe to CdSe. This is mainly ascribed to the lower conduction band (CB) of CdSexTe1-x with higher Se content, which reduces the driving force for electron injection into TiO2. Finally, the performance is improved by mixing CdSexTe1-x NCs with conjugated polymer poly(p-phenylenevinylene) (PPV), and power conversion efficiency (PCE) of 3.35% is achieved based on ternary NCs. This work may provide some information to further optimize the aqueous-processed NC and hybrid solar cells.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Qingsen
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Zhaolai
authors.initials: Z
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Xiaohang
authors.initials: X
authors.lastname: Du
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Gan
authors.initials: G
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Fengxia
authors.initials: F
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, and ‡State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun, 130012, P. R. China.
authors.forename: Bai
authors.initials: B
authors.lastname: Yang
keywords: CdSexTe1−x; CdTe; aqueous process; electron injection; hybrid; nanocrystal; solar cell