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 VOC 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 VOC 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
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CAS Number
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n.a.
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Chemical Formula
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C24H22Br2NO3P
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Molecular Weight
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561.2 g/mol
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Absorption*
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λmax (n.a.)
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Fluorescence
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λem (n.a.)
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HOMO/LUMO
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HOMO = 5.56 eV, LUMO = 2.54 eV
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Synonyms
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Br-4PADCB, (4-(5,9-Dibromo-7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid
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Classification or Family
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7H-dibenzo[c,g]carbazole derivatives, Self-assembly monolayers, Hole transport layer, Hole extraction layer, p-i-n Perovskite solar cells, Organic photovoltaics
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Product Details
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Purity
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> 98% (HPLC)
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Melting Point
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Td = 269 °C
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Appearance
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White powder
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