title: Photoresponse of CsPbBr3and Cs4PbBr6Perovskite Single Crystals.
abstract: High-quality and millimeter-sized perovskite single crystals of CsPbBr3and Cs4PbBr6were prepared in organic solvents and studied for correlation between photocurrent generation and photoluminescence (PL) emission. The CsPbBr3crystals, which have a 3D perovskite structure, showed a highly sensitive photoresponse and poor PL signal. In contrast, Cs4PbBr6crystals, which have a 0D perovskite structure, exhibited more than 1 order of magnitude higher PL intensity than CsPbBr3, which generated an ultralow photoresponse under illumination. Their contrasting optoelectrical characteristics were attributed to different exciton binding energies, induced by coordination geometry of the [PbBr6]4-octahedron sublattices. This work correlated the local structures of lead in the primitive perovskite and its derivatives to PL spectra as well as photoconductivity.
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Ji-Hyun
authors.initials: JH
authors.lastname: Cha
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Han
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Wenping
authors.initials: W
authors.lastname: Yin
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Cheolwoo
authors.initials: C
authors.lastname: Park
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Yongmin
authors.initials: Y
authors.lastname: Park
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Tae Kyu
authors.identifier: http://orcid.org/0000-0002-7474-6513
authors.initials: TK
authors.lastname: Ahn
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Jeong Ho
authors.identifier: http://orcid.org/0000-0002-1030-9920
authors.initials: JH
authors.lastname: Cho
authors.affiliation: Department of Chemistry, ‡School of Chemical Engineering, and §Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-do 16419, Korea.
authors.forename: Duk-Young
authors.identifier: http://orcid.org/0000-0003-3152-6382
authors.initials: DY
authors.lastname: Jung