Tag: M.W=550-600

Kim, Yong Ryun published the artcileConjugated polyelectrolytes for stable perovskite solar cells based on methylammonium lead triiodide, Name: 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, the publication is Journal of Materials Chemistry A: Materials for Energy and Sustainability (2022), 10(7), 3321-3329, database is CAplus.

Despite the outstanding role of conjugated polyelectrolytes in organic solar cells, the use of conjugated polyelectrolytes in perovskite solar cells (PSCs) has rarely been reported due to instability issues of the material itself under operating conditions. Herein, an efficient and stable inverted perovskite solar cell (p-i-n) was fabricated by introducing an amine-containing carbazole-based conjugated polyelectrolyte (CzNBr) with a simple and room temperature solution process as a cathode buffer layer (CBL) at the underlying layer of a metal electrode in PSCs. Promisingly, this approach allows not only modification of the work function of the metal electrode, yielding improved charge extraction properties, but also detainment of the migrating ionic defects of the perovskite layer induced by the metal electrode, resulting in robust stable PSCs. Ultimately, it exhibits a significant enhancement of both the efficiency (20.28%) and stability of PSCs based on methylammonium lead triiodide (MAPbI₃); nonencapsulated PSCs maintained 80% of their initial efficiency (T₈₀) under continuous heating at 85 °C for 1000 h and 50 cycles of thermal cycling tests (from -25 to 85 °C). The excellent charge extraction and detainment of ionic defects with the CzNBr layer enable the demonstration of highly stable and efficient PSCs to prove the huge potential of this new type of CBL in applications. Furthermore, our results open up new possibilities for CPEs in PSCs in terms of their performance to demonstrate easily processed highly efficient and stable PSCs.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about 1268162-40-8. 1268162-40-8 belongs to dioxole, auxiliary class Boronic acid and ester,Boronic acid and ester,Bromide, name is 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, and the molecular formula is C30H42B2BrNO4, Name: 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Xu, Xiaofeng published the artcile2,7-Carbazole-1,4-phenylene Copolymers with Polar Side Chains for Cathode Modifications in Polymer Light-Emitting Diodes, Safety of 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, the publication is Macromolecules (Washington, DC, United States) (2011), 44(11), 4204-4212, database is CAplus.

Alc.-soluble 2,7-carbazole-1,4-phenylene copolymers PCP-NOH and PCP-EP, comprising surfactant-like diethanolamino and phosphonate end groups on the side chains, resp., were synthesized and utilized as electron injection layer (EIL) in combination with high work function Al electrode in polymer light-emitting diodes (PLEDs). The UV-vis absorption and photoluminescence properties of the PCP-NOH and PCP-EP are mainly determined by the conjugated 2,7-carbazole-1,4-phenylene main chain. The PCP-NOH and PCP-EP possess comparable HOMO levels of -5.20 eV and LUMO levels around -2.35 eV. Multilayer PLEDs with a device configuration of ITO/PEDOT:PSS (40 nm)/emissive layer (70 nm)/EIL (15 nm)/Al (100 nm) were successfully fabricated. With fluorescent PFO-DBT15 as the emissive layer, the PLEDs using the PCP-NOH and PCP-EP as the EIL displayed luminous efficiency (LE) of 1.01 and 0.88 cd/A, resp., all obviously higher than 0.015 cd/A for sole Al cathode and 0.58 cd/A for the well-known Ba/Al cathode. With a phosphorescent Ir(mppy)₃-doped polymer blend (PVK:PBD:Ir(mppy)₃ = 100:30:1) as the emissive layer, the PLEDs with the EIL showed high maximum LE of 39.3 cd/A for PCP-NOH and 42.5 cd/A for PCP-EP, in comparison to 0.35 cd/A for sole Al cathode and 32.2 cd/A for the Ba/Al cathode. Particularly, the PLED with PCP-EP as EIL exhibited an excellent LE of 33.3 cd/A at a c.d. of 61.1 mA/cm² (luminance = 20 300 cd/cm²), showing weak roll-off of efficiency at high c.d. Inserting the polar alc.-soluble polymers as interlayer can significantly increase built-in potentials in the PLEDs, from which electron injection barrier from the Al electrode is decreased. The results indicate that the PCP-NOH and PCP-EP are excellent electron injection polymers for high-performance PLEDs with high work function Al electrode.

Macromolecules (Washington, DC, United States) published new progress about 1268162-40-8. 1268162-40-8 belongs to dioxole, auxiliary class Boronic acid and ester,Boronic acid and ester,Bromide, name is 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, and the molecular formula is C14H22BNO4S, Safety of 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Xu, Xiaofeng published the artcileConjugated polyelectrolytes and neutral polymers with poly(2,7-carbazole) backbone: Synthesis, characterization, and photovoltaic application, Name: 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2011), 49(5), 1263-1272, database is CAplus.

Poly(2,7-carbazole) neutral polymers (PC-N, PC-NOH, and PC-P) and polyelectrolytes (PC-NBr and PC-SO₃Na) with hydrophilic pendant groups of ammonium, phosphonate, and sulfonate were synthesized as interlayers for cathode modifications in bulk-heterojunction photovoltaic cells (BHJ PVCs). The absorptions of the polymers were determined by the poly(2,7-carbazole) backbone, showing absorption peaks at ∼390 nm for their solutions and films. Because of large intermol. interactions, excimer emissions with wavelengths higher than 500 nm were found in the photoluminescence spectra of the films of the polymers, which weakened the light emissions of the polymers. PC-N, PC-NBr, PC-NOH, and PC-P possessed comparable HOMO levels of -5.23 eV and LUMO levels of -2.4 eV, but HOMO and LUMO levels of PC-SO₃Na were up-lying to -4.91 and -2.12 eV, resp. PC-N, PC-NBr, PC-NOH, and PC-P were selected to construct thin interlayers in BHJ PVCs with PFO-DBT35:PCBM = 1:4 as the active layer. Compared with traditional Al cathode, bilayer cathodes with the interlayers showed improvements of open-circuit voltages and short-circuit currents of the PVCs. PC-NOH was the best for the photovoltaic performances and over 20% increase of power conversion efficiency (PCE) was achieved. The bilayer cathodes would have great potential to further elevate PCE of BHJ PVCs with other active layer materials. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 1268162-40-8. 1268162-40-8 belongs to dioxole, auxiliary class Boronic acid and ester,Boronic acid and ester,Bromide, name is 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, and the molecular formula is C6H8O4, Name: 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Xu, Xiaofeng published the artcileConjugated polyelectrolytes and neutral polymers with poly(2,7-carbazole) backbone: Synthesis, characterization, and photovoltaic application, Name: 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2011), 49(5), 1263-1272, database is CAplus.

Poly(2,7-carbazole) neutral polymers (PC-N, PC-NOH, and PC-P) and polyelectrolytes (PC-NBr and PC-SO₃Na) with hydrophilic pendant groups of ammonium, phosphonate, and sulfonate were synthesized as interlayers for cathode modifications in bulk-heterojunction photovoltaic cells (BHJ PVCs). The absorptions of the polymers were determined by the poly(2,7-carbazole) backbone, showing absorption peaks at ∼390 nm for their solutions and films. Because of large intermol. interactions, excimer emissions with wavelengths higher than 500 nm were found in the photoluminescence spectra of the films of the polymers, which weakened the light emissions of the polymers. PC-N, PC-NBr, PC-NOH, and PC-P possessed comparable HOMO levels of -5.23 eV and LUMO levels of -2.4 eV, but HOMO and LUMO levels of PC-SO₃Na were up-lying to -4.91 and -2.12 eV, resp. PC-N, PC-NBr, PC-NOH, and PC-P were selected to construct thin interlayers in BHJ PVCs with PFO-DBT35:PCBM = 1:4 as the active layer. Compared with traditional Al cathode, bilayer cathodes with the interlayers showed improvements of open-circuit voltages and short-circuit currents of the PVCs. PC-NOH was the best for the photovoltaic performances and over 20% increase of power conversion efficiency (PCE) was achieved. The bilayer cathodes would have great potential to further elevate PCE of BHJ PVCs with other active layer materials. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 1268162-40-8. 1268162-40-8 belongs to dioxole, auxiliary class Boronic acid and ester,Boronic acid and ester,Bromide, name is 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole, and the molecular formula is C6H8O4, Name: 9-(6-Bromohexyl)-2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem