Voltage output of efficient perovskite solar cells with high open-circuit voltage and fill factor

Besides the generated photocurrent as a key factor that impacts the efficiency of solar cells, the produced photovoltage and fill factor are also of critical importance. Therefore, understanding and optimization of the open-circuit voltage (V sub(oc)) of perovskite solar cells, especially with an ar...

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Bibliographic Details
Published in:Energy & environmental science 2014, Vol.7 (8), p.2614-2618
Main Authors: Ryu, Seungchan, Noh, Jun Hong, Jeon, Nam Joong, Chan Kim, Young, Yang, Woon Seok, Seo, Jangwon, Seok, Sang Il
Format: Article
Language:English
Subjects:
Electric potential
Energy levels
Molecular orbitals
Perovskites
Photovoltages
Photovoltaic cells
Solar cells
Voltage
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Summary:Besides the generated photocurrent as a key factor that impacts the efficiency of solar cells, the produced photovoltage and fill factor are also of critical importance. Therefore, understanding and optimization of the open-circuit voltage (V sub(oc)) of perovskite solar cells, especially with an architecture consisting of mesoporous (mp)-TiO sub(2)/perovskite/hole transporting materials (HTMs), are required to further improve the conversion efficiency. In this work, we study the effects of the energy level between CH sub(3)NH sub(3)(= MA)PbI sub(3) and MAPbBr sub(3) and a series of triarylamine polymer derivatives containing fluorene and indenofluorene, which have different highest occupied molecular orbital (HOMO) levels, in terms of the photovoltaic behaviour. The voltage output of the device is found to be dependent on the higher energy level of perovskite solar absorbers as well as the HOMO level of the HTMs. The combination of MAPbBr sub(3) and a deep-HOMO HTM leads to a high photovoltage of 1.40 V, with a fill factor of 79% and an energy conversion efficiency of up to 6.7%, which is the highest value reported to date for MAPbBr sub(3) perovskite solar cells.
ISSN:1754-5692
1754-5706
DOI:10.1039/c4ee00762j