title: Methoxydiphenylamine-substituted fluorene derivatives as hole transporting materials: role of molecular interaction on device photovoltaic performance.
abstract: The molecular structure of the hole transporting material (HTM) play an important role in hole extraction in a perovskite solar cells. It has a significant influence on the molecular planarity, energy level, and charge transport properties. Understanding the relationship between the chemical structure of the HTM's and perovskite solar cells (PSCs) performance is crucial for the continued development of the efficient organic charge transporting materials. Using molecular engineering approach we have constructed a series of the hole transporting materials with strategically placed aliphatic substituents to investigate the relationship between the chemical structure of the HTMs and the photovoltaic performance. PSCs employing the investigated HTMs demonstrate power conversion efficiency values in the range of 9% to 16.8% highlighting the importance of the optimal molecular structure. An inappropriately placed side group could compromise the device performance. Due to the ease of synthesis and moieties employed in its construction, it offers a wide range of possible structural modifications. This class of molecules has a great potential for structural optimization in order to realize simple and efficient small molecule based HTMs for perovskite solar cells application.
authors.affiliation: Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, 50254, Kaunas, Lithuania.
authors.forename: Robertas
authors.initials: R
authors.lastname: Tiazkis
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Rue de l'Industry 17, CH-1951, Sion, Switzerland.
authors.forename: Sanghyun
authors.initials: S
authors.lastname: Paek
authors.affiliation: Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, 50254, Kaunas, Lithuania.
authors.forename: Maryte
authors.initials: M
authors.lastname: Daskeviciene
authors.affiliation: Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, 50254, Kaunas, Lithuania.
authors.forename: Tadas
authors.initials: T
authors.lastname: Malinauskas
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Rue de l'Industry 17, CH-1951, Sion, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Saliba
authors.affiliation: Department of Solid State Electronics, Vilnius University, Sauletekio 9, 10222, Vilnius, Lithuania.
authors.forename: Jonas
authors.initials: J
authors.lastname: Nekrasovas
authors.affiliation: Department of Solid State Electronics, Vilnius University, Sauletekio 9, 10222, Vilnius, Lithuania.
authors.forename: Vygintas
authors.initials: V
authors.lastname: Jankauskas
authors.affiliation: Abengoa Research, C/Energía Solar n° 1, Campus Palmas Altas, 41014, Sevilla, Spain.
authors.forename: Shahzada
authors.initials: S
authors.lastname: Ahmad
authors.affiliation: Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, 50254, Kaunas, Lithuania. vytautas.getautis@ktu.lt.
authors.forename: Vytautas
authors.initials: V
authors.lastname: Getautis
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Rue de l'Industry 17, CH-1951, Sion, Switzerland. mdkhaja.nazeeruddin@epfl.ch.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Khaja Nazeeruddin