Photovoltaic studies on cadmium metal ions doped coordination polymer/TiO₂ hybrid solar cell

The Performance Shift due to Light Irradiation on the Electrode of an All‐Solution‐Processed Semitransparent Polymer Solar Cell

“…Figure shows electrochemical impedance spectra (EIS) of one of the developed PSC devices after different durations of light irradiation exposure at 0 V. Although the change of the EIS is tiny, the continuous drop of impedance with light irradiation enhances the PSC performance because of the reduction of the contact resistance between the PEDOT:PSS (PEG) electrode and the P3HT:PCBM active layer. It is important to note that similar results have been achieved by Lee et al [ 17 ]…”

“…Figure 6 shows electrochemical impedance spectra (EIS) of one of the developed PSC devices after different durations of light irradiation exposure at 0 V. Although the change of the EIS is tiny, the continuous drop of impedance with light irradiation enhances the PSC performance because of the reduction of the contact resistance between the PEDOT:PSS (PEG) electrode and the P3HT:PCBM active layer. It is important to note that similar results have been achieved by Lee et al [17] The performance of semitransparent PSCs based on PEDOT: PSS (PEG)as the transparent electrode was improved, which is due to the conformation change of PEDOT chains after light irradiation. To gain further information on the performance information on the mechanism and investigate the possible changes in the morphology and correlation between morphology and performance, AFM images are given out, and the AFM images of PEDOT:PSS (PEG) film after light irradiation (0, 5, 10, 30 min) are shown in Figure 7.…”

“…[ 15 ] On the other hand, for PSC devices using PEDOT:PSS as an anode buffer, the performance enhancement has been attributed to the exposure of PEDOT:PSS to light irradiation before device fabrication. [ 16–18 ] Although different light treatment methods were used (different light intensities and processing times), similar results were obtained, confirming that the main enhancement in these polymer solar cells is attributed to the increase in the conductivity of PEDOT:PSS due to the 1) conformation change of PEDOT chains, [ 16,17,19 ] as well as 2) increase in the work function of PEDOT:PSS (or change in its hydrophilicity). [ 18,20 ] As a conductive polymer, PEDOT:PSS also can be used as a transparent electrode in transparent or semitransparent PSCs after doping, [ 21 ] such as polyethylene glycol (PEG), [ 22 ] dimethyl sulphoxide (DMSO), [ 23 ] methanol, [ 24 ] etc.…”

“…This enhancement has been attributed to different mechanisms. [12][13][14][15][16][17][18][19][20] For PSC devices using metal oxides as cathode buffers (glass/indium tin oxide (ITO)/TiO x / poly(3-hexylthiophene)(P3HT): [6,6]-phenyl-C61 butyric acid methyl ester (PCBM)/Au, ITO/TiO x /P3HT: PCBM/MoO 3 /Ag, and polyethylene terephthalate(PET)/ITO/ ZnO/P3HT:PCBM/poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/Ag), the performance enhancement has been mainly attributed to the filling of electron traps in metal oxides, resulting in an increase in the conductivity of metal oxides, [12,13] as well as the enhancement of the builtin electric field upon UV illumination. [14] The desorption or redistribution of oxygen has also been ascribed as a performance improvement mechanism.…”

Plasmonic nano-particles mediated energy harvesting in thin-film organic solar cells

“…However, these changes on HOMO/LUMO levels need to take into account the mechanisms that reduce charge recombination at donor/acceptor interfaces. It is worth noting the critical role that the inter-facial layers play in the charge collection processes for high PCE [10][11][12][13][14][15][16]. Currently, PCE exceeding 18% has been achieved from non-fullerene acceptors based on TFOSCs [17,18].…”