PTAA

Fluoro-PTAA, HTL material for perovskite and polymer solar cells
Used to improve device efficiency and device operating lifetime

Fluoro-PTAA (specifically known as 1F-PTAA), or poly(bis(4-phenyl)(4-fluoro-2-methylphenyl)amine, is a mono-fluorinated poly(triaryl)amine which is used as a hole transporting layer (HTL) for perovskite and polymer solar cells.

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With the substitution of the methyl to fluorine on the 4-postion, the HOMO energy level is significantly lowered from 5.14 eV to 5.52 eV, which is essential to increase the open voltage (VOC) thus to improve the device efficiency. Fluorination of PTAA also drastically improves device operating lifetime, moisture and thermal stress stability. Fluoro-PTAA is therefore considered a great alternative as a hole transporting layer material for PTAA and Spiro-OMeTAD.

Perovskite solar cells (PSCs) with hexyltrimethylammounium bromide (HTAB) cast perovskite quantum wells (PQWs) and 1F-PTAA as HTL demonstrated efficiencies exceeding 22% along with significantly improved device stability

Device Structure(s)

Device structure	FTO/SnO2/Cs0.05FA0.81MA0.14PbI2.55Br0.45/1F-PTAA/Au [2]
JSC (mA cm-2)	23.11
VOC (V)	1.15
FF (%)	75.61
PCE	20.09

Device structure	FTO/SnO2/Cs0.05FA0.81MA0.14PbI2.55Br0.451F-PTAA/Au [2]
JSC (mA cm-2)	23.72
VOC (V)	1.21
FF (%)	77.21
PCE	22.16

General Information

CAS number	N.A.
Chemical formula	(C19H14NF)n
Full name	Poly(bis(4-phenyl)(4-fluoro-2-methylphenyl)amine
Molecular weight	Please see batch details
HOMO / LUMO	HOMO 5.52 eV, LUMO 2.55 eV [1]
Recommended solvents	Chlorobenzene, chloroform, THF and toluene
Synonyms	F-PTAA, FMe-PTAA, 1F-PTAA
Classification / Family	Polyamines, Hole-transport layer materials, Electron-blocking layer materials, Organic semiconducting materials, Organic photovoltaics, Polymer solar cells, Perovskite solar cells, OLED materials

Methyl or fluoro substituted poly(triarylamines) (PTAAs) are electron rich with diphenylamine as the the backbone and substituted phenyl as side chains. Substituted PTAAs are originally used as hole transport layer (HTL) materials in OLED/OFET devices to improve charge extractions. PTAA can also act as electron blocking layer to reduce the chances of electron–hole recombination and energy loss in electronic devices. Fluorinated PTAA, 1F-PTAA and 2F-PTAA, can effectively downshift the HOMO levels of PTAA derivatives due to the electron deficiency of fluorine, resulting in an increase of VOC hence the power conversion efficiency (PCE) of the device.

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PTAA

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