Premium
Hole‐Transport Materials Containing Triphenylamine Donors with a Spiro[fluorene‐9,9′‐xanthene] Core for Efficient and Stable Large Area Perovskite Solar Cells (Solar RRL 9∕2017)
Author(s) -
Wu Guohua,
Zhang Yaohong,
Kaneko Ryuji,
Kojima Yoshiyuki,
Sugawa Kosuke,
Chowdhury Towhid H.,
Islam Ashraful,
Shen Qing,
Akhtaruzzaman Md.,
Noda Takeshi,
Otsuki Joe
Publication year - 2017
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201770134
Subject(s) - triphenylamine , perovskite (structure) , materials science , perovskite solar cell , solar cell , energy conversion efficiency , optoelectronics , chemistry , crystallography
The perovskite solar cell is one of the most promising next‐generation solar cells. The best performing solar cells use a hole‐transport material called "spiro‐OMeTAD". The problems associated with this hole‐transport material are its high cost and poor durability. Here, Wu et al. (article No. 201700096 ) have developed new hole‐transport materials of which the production cost estimated to be about 1/3 of that of spiro‐OMeTAD. These new hole‐transport materials worked nearly as well as spiro‐OMeTAD. The HOMO energy levels were estimated to be −5.34 to −5.37 eV, which are higher than the valence band w a hole‐extraction layer from the photoexcited perovskite. The LUMO energy levels are much higher than the conduction band edge of the perovskite, which makes these materials suitable as an electron‐blocking layer. Finally, the efficiencies of the cells with the new hole‐transport materials were the same or even exceeded the efficiency of a spiro‐OMeTAD‐based cell at the 10th day after fabrication, which shows that the new hole‐transport materials are better in terms of on‐the‐shelf durability than spiro‐OMeTAD.