Star-Shaped Hole Transporting Materials with Triphenylamine Core for Perovskite Solar Cells with 12.38% Conversion Efficiency

An-Na Cho^a, Hui-Seon Kim^a, Nam-Gyu Park^a, Xavier Sallenave^b, Fabrice Goubard^b, Thanh-Tuan Bui^b

^aSungkyunkwan University, South Korea, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, Korea, Republic of

^bLaboratoire de Physicochimie des Polymeres et des Interfaces, Universite de Cergy-Pontoise, 5 mail Gay Lussac, 95000 Neuville-sur-Oise

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, An-Na Cho, 159
Publication date: 5th February 2015

Recently, variety of triphenylamine (TPA) units have been widely studied and showed efficient charge transport and good morphological stability. Here we report a new star-shaped hole transport material (HTM) BT41 (tris(4-(5-(4,4'-dimethoxydiphenylaminyl)-2-thiophenyl)phenyl)amine) (Figure 1) with TPA core and short pi-conjugated branch. BT41 was applied to CH₃NH₃PbI₃ perovskite solar cell. Compared to the convetional spiro-MeOTAD HTM, BT41 showed 50mV higher open-circuit voltage (V_oc) despite 0.08 eV higher HOMO level, which was due to less recombination at BT41/perovskite interface as confirmed by impedance study. It was found that photovoltaic performance was significantly affected by additives. V_oc was improved in the presence of 4-tert-butylpyridine (TBP) and fill factor (FF) was improved when TBP was coupled with bis(trifluoromethane)sulfonimide lithium salt (Li-TFSI), whereas photocurrent density (J_sc) was hardly influenced by Li-TFSI concentration. Device performance with BT41 was also affected by surface morphology of perovskite, where flat surface was better in photovoltaic performance than rough surface with large cuboid crystals. This indicates that interfacial eneginnering is crucial in case of molecular BT41 HTM. The best photovoltaic performance incorporating BT41 demonstrated J_sc of 18.46 mA/cm2, V_oc of 1.03 V and FF of 0.65, leading to overall power conversion efficiency of 12.38%.
Figure 1. Structure of BT41

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.