CAS 6245-75-6 N-(2-Carboxyethyl)iminodiacetic acid

The Use of N-(2-Carboxyethyl)iminodiacetic acid as an Alcohol-Soluble Cathode Interfacial Layer for PSCs

Improved efficiency of polymer solar cells via utilizing Alcohol-Soluble Small Molecules N-(2-Carboxyethyl)iminodi acetic acid as cathode interfacial layer Zhang C, et al. Optical Materials, 2022, 133, 112981.

This study explores the use of N-(2-Carboxyethyl)iminodiacetic acid (C7H11NO6) as an alcohol-soluble cathode interfacial layer for PSCs with a conventional device structure. The results demonstrated that the optimal concentration of C7H11NO6 led to a significant enhancement in the device's power conversion efficiency (PCE), reaching as high as 8.86%. The improvement is attributed to the effective formation of an interfacial dipole on the surface of the PTB7-Th active layer, which facilitates better electron extraction and reduces energy loss at the cathode interface. The C7H11NO6 film serves as an efficient cathode interfacial layer, which not only enhances charge transport but also improves the overall stability of the PSCs.
Experimental Section
The device fabrication process closely follows the methods outlined in our previous research. Initially, a thin PEDOT
layer (30 nm) was spin-coated onto an ITO substrate to form the anode buffer layer. The photoactive layer, consisting of a blend of PTB7-Th
with 5% Ethyl 2-hydroxybenzoate (EHB), was prepared at a total concentration of 25 mg/ml with a 1:1.5 ratio. This blend was dissolved in chlorobenzene and then spin-coated onto the PEDOT
layer to create a 100 nm active layer.
Subsequently, the alcohol-soluble C7H11NO6 solution was spin-coated onto the active layer at varying concentrations to form the cathode interfacial layer. Finally, a 100 nm Al electrode was deposited on top of the cathode layer using thermal evaporation.
This study underscores the effectiveness of N-(2-Carboxyethyl)iminodiacetic acid as a cathode interfacial layer in PSCs, highlighting its potential to significantly improve the efficiency and stability of these devices through simple and scalable modifications.

Catalog Number	ACM6245756-2
CAS	6245-75-6
Structure
Synonyms	N,N-Bis(carboxymethyl)-beta-alanine
IUPAC Name	3-[Bis(carboxymethyl)amino]propanoic acid
Molecular Weight	205.17
Molecular Formula	C7H11NO6
Canonical SMILES	C(CN(CC(=O)O)CC(=O)O)C(=O)O
InChI	InChI=1S/C7H11NO6/c9-5(10)1-2-8(3-6(11)12)4-7(13)14/h1-4H2,(H,9,10)(H,11,12)(H,13,14)
InChI Key	UWRBFYBQPCJRRL-UHFFFAOYSA-N
Boiling Point	495.8ºC at 760 mmHg
Melting Point	195 °C
Flash Point	253.7ºC
Purity	98%+
Density	1.517g/cm³
Complexity	222
Covalently-Bonded Unit Count	1
Defined Atom Stereocenter Count	0
EC Number	228-360-6
Exact Mass	205.05863707
Heavy Atom Count	14
Hydrogen Bond Acceptor Count	7
Hydrogen Bond Donor Count	3
Monoisotopic Mass	205.05863707
Physical State	Solid
Rotatable Bond Count	7
Topological Polar Surface Area	115 Å²