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9CAA

Product Name: 9CAA, CzAA, Carbazol-9-yl-acetic acid, 2-(9H-Carbazol-9-yl)acetic acid
Catalog Number: ALCM524801
CAS Number: 524-80-1

Product Description

Chemical Structure of 9CAA

9CAA (2-(9H-Carbazol-9-yl)acetic acid) is a small organic molecule based on a carbazole core, engineered for the formation of self-assembled monolayers (SAMs) on conductive substrates. It features a carboxylic acid anchoring group connected via a methylene spacer to a carbazole core, enabling strong interfacial binding and efficient charge extraction.

As a SAM material, 9CAA is particularly suitable for use as a hole transport or extraction layer in non-fullerene acceptor (NFA) organic solar cells and p-i-n structured perovskite solar cells. The carboxylic acid group binds effectively to metal oxide surfaces such as fluorine-doped tin oxide (FTO), supporting the formation of well-ordered monolayers that enhance charge selectivity and reduce recombination.

In tin–lead (Sn–Pb) perovskite solar cells, 9CAA has shown advantages over phosphonic acid analogs in terms of interfacial alignment, electronic coupling, and crystallinity of the active layer. Devices incorporating 9CAA have demonstrated excellent stability, maintaining high efficiency after extended storage in inert conditions.

Thanks to its compatibility with mild solution-based processing, 9CAA serves as a promising alternative to PEDOT:PSS, enabling seamless integration into scalable and flexible photovoltaic manufacturing.

Applications

Hole transport layer for organic photovoltaic devices
Hole-selective contact in p-i-n perovskite solar cells
Interface modifier for Sn–Pb perovskite solar cells
Replacement for PEDOT:PSS in thin-film solar cells
Self-assembled monolayer formation for enhanced charge extraction

Product Information

Item	Details
CAS Number	524-80-1
Catalog Number	ALCM524801
Synonyms	CzAA, Carbazol-9-yl-acetic acid, 2-(9H-Carbazol-9-yl)acetic acid
Chemical Formula	C14H11NO2
Molecular Weight	225.24 g/mol
Purity	> 98% (HPLC)
Appearance	White powder or crystals
Melting Point	191-194 °C
HOMO / LUMO	5.35 eV (WF FTO)
Absorption	Not available
Fluorescence	Not available