title: Efficient Hole-Transporting Materials with Triazole Core for High-Efficiency Perovskite Solar Cells.
abstract: Efficient hole-transporting materials (HTMs), TAZ-[MeOTPA]2 and TAZ-[MeOTPATh]2 incorporating two electron-rich diphenylamino side arms, through direct linkage or thiophen bridges, respectively, on the C3- and C5-positions of a 4-phenyl-1,2,4-triazole core were synthesized. These synthetic HTMs with donor-acceptor type molecular structures exhibited effective intramolecular charge transfer for improving the hole-transporting properties. The structural modification of HTMs by thiophene bridging might increase intermolecular π-π stacking in the solid state and afford a better spectral response because of their increased π-conjugation length. Perovskite-based cells using TAZ-[MeOTPA]2 and TAZ-[MeOTPATh]2 as HTMs afforded high power conversion efficiencies of 10.9 % and 14.4 %, respectively, showing a photovoltaic performance comparable to that obtained using spiro-OMeTAD. These synthetically simple and inexpensive HTMs hold promise for replacing the more expensive spiro-OMeTAD in high-efficiency perovskite solar cells.
authors.affiliation: Department of Advanced Material Chemistry, Korea University, Sejong, 339-700, Republic of Korea.
authors.forename: Hyeju
authors.initials: H
authors.lastname: Choi
authors.affiliation: Department of Advanced Material Chemistry, Korea University, Sejong, 339-700, Republic of Korea.
authors.forename: Hyeonjun
authors.initials: H
authors.lastname: Jo
authors.affiliation: Department of Advanced Material Chemistry, Korea University, Sejong, 339-700, Republic of Korea.
authors.forename: Sanghyun
authors.initials: S
authors.lastname: Paek
authors.affiliation: Department of Carbon Materials/Chemistry Education, Chosun University, Gwangju, 501-759, Republic of Korea.
authors.forename: Kyungkuk
authors.initials: K
authors.lastname: Koh
authors.affiliation: Department of Bio-Nano Chemistry, Wonkwang University, Jeonbuk, 54538, Republic of Korea.
authors.forename: Haye Min
authors.initials: HM
authors.lastname: Ko
authors.affiliation: Department of Carbon Materials/Chemistry Education, Chosun University, Gwangju, 501-759, Republic of Korea. chemedujk@chosun.ac.kr.
authors.forename: Jae Kwan
authors.initials: JK
authors.lastname: Lee
authors.affiliation: Department of Advanced Material Chemistry, Korea University, Sejong, 339-700, Republic of Korea. jko@korea.ac.kr.
authors.forename: Jaejung
authors.initials: J
authors.lastname: Ko
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D004583:Electrons; D004867:Equipment Design; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D013876:Thiophenes; D014230:Triazoles; C059910:perovskite; C045575:1,2,4-triazole; D014025:Titanium
keywords: donor-acceptor systems; efficiency; hole transporting materials; perovskite solar cells; triazole