Amorphous, Fluorene-Based Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells
Sarune Daskeviciute a, Nobuya Sakai b, Marius Franckevicius c, Maryte Daskeviciene a, Artiom Magomedov a, Vygintas Jankauskas d, Henry Snaith b, Vytautas Getautis a
a Department of Organic Chemistry, Kaunas University of Technology, Radvilenu 19, 50254, Kaunas, Lithuania
b Clarendon Laboratory, Department of Physics, Oxford University, Oxford OX1 3PU, UK
c Center for Physical Sciences and Technology, Saulėtekio Av. 3, LT-10257 Vilnius, Lithuania
d Institute of Chemical Physics Vilnius University, Saule ̇tekio al.3, Vilnius LT-10257, Lithuania
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Sarune Daskeviciute, 308
Publication date: 21st February 2018

Solid-state organic hole transporting materials (HTMs) are one of the important components of the perovskite solar cells (PSCs), ensuring stability of the perovskite absorber layer, good charge separation, and as a consequence high performance of the devices. Currently, Spiro-OMeTAD is the most popular choice for the HTM layer, and is used for the majority of the state-of-the-art PSC devices. However, due to the complicated multi-step synthetic procedure, price of the Spiro-OMeTAD remains at a very high level. To overcome this drawback, novel small-molecule HTMs V1050 and V1061 were designed and synthesized. Synthesis was performed using a facile three-step synthetic route, starting from simple fluorene molecules.Coplanar central core were previously shown to have positive effect on the efficiency of HTM [1]. As a hole transporting fragment, 4,4′­-dimethoxydiphenylamine 3,6-­disubstituted carbazole was used, due to its good performance in PSCs [2]. PSCs of planar configuration, employing V1050 HTM showed a high power conversion efficiency of 18.3%, which is comparable to the 18.9% efficiency, obtained in the same device configuration, only using Spiro-OMeTAD as a HTM. In addition, devices with V1050 and V1061 showed better stability in comparison to Spiro-OMeTAD based devices. Aging test was performed on a non-encapsulated devices under uncontrolled humidity conditions (relative humidity around 60%) in the dark and under continuous full sun illumination. Overall, we believe that V1050 can became a cheaper alternative to the Spiro-OMeTAD, thus contributing to the faster translation of the PSC technology from laboratories to the market.

[1] W.-J. Chi, P.-P. Sun, Z.-S. Li, Nanoscale, 2016, 8, 17752.

[2] A. Magomedov, S. Paek et.al., Adv. Funct. Mater., 2018, 8, 1704351

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