Synthesis of spiro[dibenzo[c,h]xanthene-7,9'-fluorene]-based dopant-free hole transport materials for perovskite solar cells
Linqin Wang a, Jinbao Zhang b, Bo Xu c, Licheng Sun a d
a KTH The Royal Institute of Technology, Roslagstullsbacken 21, Stockholm, Sweden
b Monash University, Department of Materials Science and Engineering, AU, Alliance Lane, 22, Clayton, Australia
c Uppsala University, Ångström Laboratory, Sweden, Lägerhyddsvägen, 1, Uppsala, Sweden
d State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, 116024 Dalian, China
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, Linqin Wang, 286
Publication date: 21st February 2018

Organic hole transport material (HTM) is one of the important components in perovskite solar cell (PSC) to improve the device performance and device stability. Most of the reported HTMs require p-type dopants, such as LiTFSI to improve the conductivity of the hole transport layer and further improve the power conversion efficiency (PCE). However, the dopants added into the HTM layers have been confirmed that are moisture sensitive, which may accelerate the degradation of the solar cell devices and induce device instable. In this work, we designed a new series of HTMs named X61 and X62 with spiro[dibenzo[c,h]xanthene-7,9'-fluorene] (SFBX) as the skeleton. This SFBX skeleton is a spiro-type core unit but has an extended conjugation system compared with well-known spiro[fluorine-9,9’-xanthene] (SFX) skeleton, which is more beneficial for the charge transport and results in the good photovoltaic performance in perovskite solar cell devices. Herein, we applied X61 and X62 as dopant-free HTMs. One of them, the X62-based PSCs obtained a PCE of 15.94%, short-circuit photocurrent density (JSC) of 22.42 mA‧cm-2, open-circuit photovoltage (VOC) of 1.01 V, and fill factor (ff) of 70.42%. As a reference, the standard HTM Spiro-OMeTAD-based device also be measured under the same condition and reached an efficiency of 10.84%, with JSC of 19.89 mA‧cm-2, VOC of 1.04 V and ff of 52.61%. This work demonstrates that the larger conjugation system core unit SFBX based dopant-free HTMs with better steric configuration could be efficient candidates in PSCs.

1. D. Bi, B. Xu, P. Gao, et al. Nano Energy, 2016, 23, 138-144.

2. B. Xu, D. Bi, Y. Hua, et al. Energy Environ. Sci., 2016, 9, 873.

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