title: Enhanced Performance and Photostability of Perovskite Solar Cells by Introduction of Fluorescent Carbon Dots.
abstract: Perovskite solar cells (PSCs) with high efficiency have recently received tremendous attention, but the stability under light irradiation, namely, photostability, of PSCs still represents a major obstacle that must be overcome before their practical applications can be used. The degeneration of perovskite under ultraviolet irradiation from sunlight is a major impacting factor. To solve this problem, in this work we introduce fluorescent carbon dots (CDs), which could effectively convert ultraviolet to blue light in the mesoporous TiO2(m-TiO2) layer of the traditional PSCs. As a result, CD-based devices exhibit an improved power conversion efficiency (PCE) of 16.4% on average compared to 14.6% for bare devices, and the light stability of CD-based devices is highly enhanced. These devices can maintain nearly 70% of the initial efficiency after 12 h of full sunlight illumination, while the bare devices maintain only 20% of the initial efficiency. This work indicates that fluorescent down conversion based on CDs is a novel and effective approach to improve the performance and photostability of PSCs.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Jin
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Cong
authors.initials: C
authors.lastname: Chen
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Lin
authors.identifier: http://orcid.org/0000-0001-5831-430X
authors.initials: L
authors.lastname: Xu
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Biao
authors.initials: B
authors.lastname: Dong
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
authors.forename: Hongwei
authors.identifier: http://orcid.org/0000-0003-3897-5789
authors.initials: H
authors.lastname: Song
authors.affiliation: Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University , Jackson, Mississippi 39217, United States.
authors.forename: Qilin
authors.identifier: http://orcid.org/0000-0001-8680-4306
authors.initials: Q
authors.lastname: Dai
keywords: carbon dots; fluorescent down conversion; perovskite solar cells; photostability; photovoltaic performance