NDLI: Molecular structure simplification of the most common hole transport materials in perovskite solar cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Meng, Guanghao Xue, Yuan Ren, Huicai Chi, Rihan Shi, Yantao Hou, Kaili Chen, Fan Hao, Ce Wang, Kai Pang, Maoyin
Copyright Year	2016
Abstract	2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) currently is the most common hole transport material (HTM) used in perovskite solar cells (PSCs). Whereas, the hole mobility of amorphous spiro-OMeTAD remains low and may result in severe charge recombination. In addition, the harsh conditions and high cost of spiro-OMeTAD synthesis are also disadvantageous for future large-scale applications. In this paper, we report the synthesis of a new, high-yielding spiro-type HTM, 2,7-di(N,N-di-p-methoxyphenylamine)-2′,7′-di-tert-butyl-9,9′-spirobifluorene (spiro-027). The replacement of two 4,4′-dimeoxyl-diphenylamine at the 2′ and 7′ positions of conventional spiro-OMeTAD with two tert-butyl in spiro-027 results in a greatly simplified molecular structure with unaffected thermal stability or highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). In addition, enhanced hole mobility is observed in spiro-027. Thus, the PSC devices based on spiro-027 demonstrated a high power conversion efficiency (PCE) of 16.60%, which was higher than the 16.12% PCE achieved by those based on spiro-OMeTAD. By combining these results with theoretical calculations, our work confirmed the feasibility of simplifying the molecular structure of spiro-OMeTAD, which contributed to our knowledge of spiro-type optoelectronic functional materials. Moreover, our results offer a novel strategy for the replacement of expensive HTMs and the enhancement of PSCs performance.
Starting Page	96990
Ending Page	96996
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c6ra21448g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Molecular orbital PSC Perovskite Optoelectronics HOMO\/LUMO Carrier generation and recombination Butyl group
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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