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4PADCB

Product Name: 4PADCB, CbzNaph, (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid
Catalog Number: ALCM2882156638
CAS Number: 2882156-63-8

Product Description

Chemical Structure of 4PADCB

4PADCB ((4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid) is a high-performance self-assembled monolayer (SAM) molecule engineered as a hole transport and extraction layer in advanced optoelectronic devices. It features a π-conjugated 7H-dibenzo[c,g]carbazole moiety that provides strong electron-donating ability, a flexible butyl linker for spatial separation, and a phosphonic acid terminal group that forms strong covalent bonds with metal oxide surfaces such as ITO.

4PADCB has been successfully implemented in inverted perovskite solar cells (p-i-n architecture) and non-fullerene acceptor (NFA)-based polymer solar cells, where it demonstrates excellent film uniformity, interfacial compatibility, and charge selectivity. When compared to conventional HTLs like PTAA and Spiro-MeOTAD, 4PADCB provides superior energy level alignment, enhanced long-term operational stability, and is fully compatible with low-temperature, solution-based processing techniques.

The molecule's high dipole moment and preferential face-on orientation on the electrode surface contribute to densely packed monolayers, facilitating efficient hole extraction and minimizing nonradiative recombination. Its interfacial dipole also plays a crucial role in modulating the ITO work function, adjusting the energy landscape at the interface, and optimizing perovskite crystallization for improved device performance.

Additionally, 4PADCB benefits from co-solvent processing strategies, such as DMF/IPA mixtures, which significantly improve the anchoring efficiency of the phosphonic acid group and enhance monolayer coverage. This results in more uniform SAM formation, better film quality, and improved charge transport at the interface.

Advantages

Ideal for inverted and tandem perovskite solar cell architectures
High dipole moment enables strong interfacial dipole modulation
Forms compact, ordered SAMs for efficient charge extraction
Outperforms PEDOT:PSS and PTAA in device stability and efficiency
Compatible with solution processing at low concentrations
Enhances device reproducibility and interfacial uniformity

Product Information

Item	Details
CAS Number	2882156-63-8
Catalog Number	ALCM2882156638
Synonyms	CbzNaph, (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid
Chemical Formula	C24H22NO3P
Molecular Weight	403.41 g/mol
Purity	> 98% (HPLC)
Appearance	White to off-white powder
Melting Point	Td = 378 °C
HOMO / LUMO	HOMO = 5.35 eV, LUMO = 2.28 eV
Absorption	Not available
Fluorescence	Not available

Applications

Hole transport layer for perovskite solar cells (p-i-n and tandem architectures)
Hole extraction layer for organic photovoltaic (OPV) devices
Interfacial engineering material to enhance optoelectronic performance
Self-assembled monolayer for surface modification of ITO and other oxide electrodes

Why Choose Alfa Chemistry?

High-purity electronic materials optimized for cutting-edge photovoltaic applications
Trusted global supply chain with responsive technical assistance
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