title: Unravelling the working junction of aqueous-processed polymer-nanocrystal solar cells towards improved performance.
abstract: Hybrid solar cells (HSCs) based on aqueous polymers and nanocrystals are attractive due to their environmental friendliness and cost effectiveness. In this study, HSCs are fabricated from a series of water-soluble polymers with different highest occupied molecular orbital (HOMO) levels and nanocrystals with different Fermi levels. We demonstrate that the working principle of the aqueous-processed HSCs follows a p-n junction instead of a type-II heterojunction. The function of the polymer is to provide an interface dipole which can improve the build-in potential of the HSCs. Subsequently, the aqueous-processed HSCs are optimized following a p-n junction and an improved PCE of 5.41% is achieved, which is the highest for aqueous-processed HSCs. This study will provide instructive guidelines for the development of aqueous-processed HSCs.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China. byangchem@jlu.edu.cn.
authors.forename: Zhaolai
authors.initials: Z
authors.lastname: Chen
authors.forename: Xiaohang
authors.initials: X
authors.lastname: Du
authors.forename: Gan
authors.initials: G
authors.lastname: Jin
authors.forename: Qingsen
authors.initials: Q
authors.lastname: Zeng
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Liu
authors.forename: Bai
authors.initials: B
authors.lastname: Yang