Opto(electrical) properties of triphenylamine-based polyazomethine and its blend with [6,6]-phenyl C₆₁ butyric acid methyl ester

Abstract

Polyazomethine (OFBF-TPA) based on triphenylamine (TPA) and octafluorobiphenyl (OFBF) moieties was tested as donor-acceptor (D-A) for bulk heterojunction polymeric solar cells. The temperatures of 5% weight loss (T 5% ) of the polyazomethine range from 323 to 328 C, depending on the gas used (air and nitrogen). The conductivity of OFBF-TPA was approximately 10 À10 S/cm for not annealed sample and at about 10 À6 S/cm for the ones annealed at room temperature, as determined by impedance spectroscopy. Surface of the polymer and mixture polymer-[6,6]-phenyl C 61 butyric acid methyl ester (PCBM) was smooth with the R ms value in the range 0.58-1.95 nm as was detected by the atomic force microscopy (AFM) technique. UV-vis spectrum of the mixture OFBF-TPA-PCBM exhibited higher absorption intensity than the UV-vis spectrum of OFBF-TPA lacking PCBM. The thin solid film of OFBF-TPA and OFBF-TPA-PCBM showed one main absorption band with a maximum peak at 414 and 411 nm, respectively. For the mixture OFBF-TPA-PCBM, the second absorption band at 333 nm was found. No influence of annealing on the absorption properties was observed. The polymer solar cell devices were fabricated by spin coating the blend solution of the OFBF-TPA and PCBM and investigated in dark and under an illumination of 100 mW/cm 2 , with an AM1.5 G. Electrical behavior of the device indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) (PEDOT)-poly(styrenesulfonate) (PSS)/OFBF-TPA-PCBM/Al was tested by impedance spectroscopy in dark and under illumination. For all measured devices, Nyquist plots were presented. The annealing significantly improved the electrical conductivity of the investigated devices. Electrical and photovoltaic properties of OFBF-TPA were compared with the properties of polyazomethine based on TPA and fluorene moieties (F-TPA).

New environmentally friendly polyazomethines with thiophene rings for polymer solar cells

“…In addition, we studied the photovoltaic properties of liquid crystalline poly(siloxane-azomethine)s. The obtained PCE was approximately 0.01% Palewicz et al, 2011). Finally, we investigated polyazomethines with a triphenylamine group (Iwan et al, 2013b(Iwan et al, , 2014d, and a record PCE value of 0.56% was obtained for air-stable aromatic polyazomethine with triphenylamine moieties (Iwan et al, 2014d). In Table 1, the chemical structures and PCEs of all of the investigated polyazomethines for photovoltaic applications are summarized.…”

Enhanced power conversion efficiency in bulk heterojunction solar cell based on new polyazomethine with vinylene moieties and [6,6]-phenyl C61 butyric acid methyl ester by adding 10-camphorsulfonic acid

“…Instead of P3HT and PCDTBT other polymers and copolymers with thiophene, vinylene, benzothiadiazole, carbazole and azomethine units (e.g. [13][14][15][16][17][18][19][20]72,73]) have been investigated in polymer photovoltaics taking into consideration their thermal and air stability.…”

“…[3,4,[9][10][11][12]). At the last time some researchers propose to use them as a donor in the active layer of polymer solar cells [13][14][15][16][17][18][19][20].…”

“…[13][14][15][16][17][18][19][20][40][41][42][43][44][45][46][47][48][49][50][51][52][53]), synthesis and used of graphene, graphene oxide, carbon nanotubes, fullerenes and their derivatives in active layer or as an interlayer or electrodes in PV devices (e.g. [43,54,55]), synthesis of new polymers or graphene as a flexible substrate for PV devices (e.g.…”

New air-stable aromatic polyazomethines with triphenylamine or phenylenevinylene moieties towards photovoltaic application

“…Bulk heterojunction (BHJ) polymer solar cells are investigated in three main directions: (i) application of new polymers or small compounds, (ii) creation of new solar cell architectures and (iii) works we described photovoltaic properties of PAZ with TPA and octafluorobiphenyl moieties [26], thiophene and cardo moieties [27] and LC polyazomethines [28,29] (PCE = 0.04%, 1.47 × 10 −3 % and 0.01%, respectively).…”