DCB-BPA

Small Self-Assembled Monolayer Molecule for High Efficiency Solar Cells

DCB-BPA, Face-on hole transport or extraction layer for NFA-polymer solar cells and p-i-n perovskite solar cells, (4-(5,9-Dibromo-7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid

DCB-BPA is a self-assembled monolayer material with a 5,9-dibromo-7H-dibenzo[c,g]carbazole terminal function group, a butyl linker and a phosphonic acid head anchor. DCB-BPA is the brominated derivative of 4PADCB, another hole selective face-on contact interface material for highly efficient and stable inverted perovskite solar cells.

DCB-BPA was initially developed as the hole selective layer for wide bandgap (WBG) perovskite solar cells. DCB-BPA contact can effectively enhance the energy level alignment and suppress the interfacial nonradiative recombination losses by enabling the growth of high-quality WBG perovskite with an improved buried interface and reduced trap state density.

With a very low V_OC loss of 431 mV, perovskite solar cell device based on a 1.77 eV WBG perovskite absorber and DCB-BPA self-assembled monolayer interface chieved a power conversion efficiency (PCE) of 18.88%, with an impressive V_OC of up to 1.339 V. Also, due to the improved interface charge extraction/transport, PM6:BTP-eC9 based polymer organic solar cell delivered a power conversion efficiency of 18.16% and an outstanding short-circuit current of ~ 28.07 mA cm⁻², outperforming devices based on conventional PEDOT:PSS hole transport layer.

Serving as hole selective contact for organic solar cells and perovskite solar cells, DCB-BPA is an alternative to PEDOT:PSS with superior performance with the convenience of solution deposition at low concentration, i.e. 1 mM.

Solution Processing Procedure

Typical processing solvents: Ethanol, methanol, IPA, DMF, THF
Typical concentration: 0.1 - 1.2 mg/ml
Typical processing procedure: 

For DCB-BPA based perovskite devices, DCB-BPA is dissolved in anhydrous ethanol with a concentration of 0.1, 0.2, or 0.4 mg/mL. The DCB-BPA solution is spin-coated for 30 s at the speed of 3000 rpm, and then annealed for 10 min at 120 ℃ (DOI: 10.1039/D3EE02839A). 

For DCB-BPA based OSCs, DCB-BPA is dissolved in methanal with a concentration of 0.8, 1.0, or 1.2 mg/mL. The DCB-BPA solution is spin-coated onto ITO substrates for 30 s at the speed of 3000, 4000 or 5000 rpm, and then annealed for 10 min at 100 °C in air (DOI: 10.1002/adfm.202303653).

General Information

Product Details

Chemical Structure

MSDS Documentation

DCB-BPA MSDS Sheet

Literature and Reviews

1. W. Wang et al. (2023); Versatile Self-Assembled Hole Transport Monolayer Enables Facile Processing Organic Solar Cells over 18% Efficiency with Good Generality, Adv. Funct. Mater., 33 (41), 2303653; DOI: 10.1002/adfm.202303653.
   
2. Z. Yi et al. (2024); Achieving a high open-circuit voltage of 1.339 V in 1.77 eV wide-bandgap perovskite solar cells via self-assembled monolayers, Energy Environ. Sci., 17, 202-209; DOI: 10.1039/D3EE02839A.
   
3. Y. Duan et al. (2024); A Comprehensive Review of Organic Hole-Transporting Materials for Highly Efficient and Stable Inverted Perovskite Solar Cells, Adv. Funct. Mater., 34 (25), 2315604; DOI: 10.1002/adfm.202315604.
   
4. P. Han et al. (2024); Recent Advances in Carbazole-Based Self-Assembled Monolayer for Solution-Processed Optoelectronic Devices, Adv. Mater., 2405630; DOI: 10.1002/adma.202405630.
   
5. J. Suo et al. (2024); The Dual Use of SAM Molecules for Efficient and Stable Perovskite Solar Cells, Adv. Energy Mater., 2400205; DOI: 10.1002/aenm.202400205.
   
6. J. Lim et al. (2024); All-perovskite tandem solar cells: from fundamentals to technological progress, Energy Environ. Sci., Advance Article; DOI: 10.1039/D3EE03638C