Organic photovoltaic with PEDOT:PSS and V2O5 mixture as hole transport layer

Kanwat

et al. 2014

Phys. Status Solidi A

Self Cite

We studied the solution processed vanadium pentoxide (V2O5) doping effect in PEDOT:PSS for use in hole injection layer (HIL), and as a result, V2O5 doped PEDOT:PSS improved the performance of polymer light‐emitting diode (PLED) significantly. The improvement is related to the increased conductivity of PEDOT:PSS by V2O5 doping. This improvement enhances hole injection into the emission layer, and it will improve the charge balance. The PLED with PEDOT:PSS HIL and super yellow polymer has maximum current and power efficiencies of 12.01 cd A−1 and 9.67 lm W−1, respectively. On the other hand, the device with V2O5 (10:1) doped PEDOT:PSS indicates the maximum current and power efficiencies of 15.12 cd A−1 and 12.66 lm W−1, respectively, indicating that the efficiencies increase over 20% compared to the control device. The leakage currents of the PLED decrease to ∼10% of the control PLED. Note also that V2O5 suppressed the diffusion of indium from anode to PEDOT:PSS, and also prevented the acidic damage from sulfate ions of PEDOT:PSS to IZO and active layer.

Section: Methodsmentioning

confidence: 99%

Solution processed polymer light emitting diode with vanadium-oxide doped PEDOT:PSS

Kanwat

et al. 2014

Phys. Status Solidi A

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“…Poly (3,4-ethylenedioxythiophene): Poly (styrenesulfonate) (PEDOT:PSS) is regarded as state of the art HTL which is being used as a standard material for BHJ OPVs because of its high work function, easy solution process-ability, high conductivity and high optical transmittance78. However, owing to the highly acidic and hygroscopic nature of PEDOT:PSS, it favours the device degradation in number of ways910.…”

mentioning

confidence: 99%

Significantly improved photovoltaic performance in polymer bulk heterojunction solar cells with graphene oxide /PEDOT:PSS double decked hole transport layer

Rafique

Abdullah

Shahid

et al. 2017

Sci Rep

109

This work demonstrates the high performance graphene oxide (GO)/PEDOT:PSS doubled decked hole transport layer (HTL) in the PCDTBT:PC71BM based bulk heterojunction organic photovoltaic device. The devices were tested on merits of their power conversion efficiency (PCE), reproducibility, stability and further compared with the devices with individual GO or PEDOT:PSS HTLs. Solar cells employing GO/PEDOT:PSS HTL yielded a PCE of 4.28% as compared to either of individual GO or PEDOT:PSS HTLs where they demonstrated PCEs of 2.77 and 3.57%, respectively. In case of single GO HTL, an inhomogeneous coating of ITO caused the poor performance whereas PEDOT:PSS is known to be hygroscopic and acidic which upon direct contact with ITO reduced the device performance. The improvement in the photovoltaic performance is mainly ascribed to the increased charge carriers mobility, short circuit current, open circuit voltage, fill factor, and decreased series resistance. The well matched work function of GO and PEDOT:PSS is likely to facilitate the charge transportation and an overall reduction in the series resistance. Moreover, GO could effectively block the electrons due to its large band-gap of ~3.6 eV, leading to an increased shunt resistance. In addition, we also observed the improvement in the reproducibility and stability.

“…Impedance spectroscopy is a powerful method to not only characterize material properties but also to understand device operation as well as stability of one particular system. [48][49][50] Figure 7b depicts the typical complex impedance plan spectra of the tandem cells with different ICLs measured in the dark at zero bias. Figure 7b demonstrates the imaginary resistance over the real resistance and there are two semicircles can be found, in which it enables examination of the internal resistance of the ICLs.…”

Section: Resultsmentioning

confidence: 99%

“…LZO Solution: LZO solution preparation has been published elsewhere. 50 TiO 2 Solution: The preparation step for TiO 2 solution was completed according to the previously published article, 51 where titanium (IV) isopropoxide was used as precursor.…”

Section: Methodsmentioning

confidence: 99%

High-Performance Inverted Tandem Polymer Solar Cells Utilizing Thieno[3,4-c]pyrrole-4,6-dione Copolymer

Yusoff

Lee

ACS Appl. Mater. Interfaces

et al. 2014

Self Cite

We demonstrated the inverted solution processed tandem polymer solar cells, in which transparent pH-neutral poly(3,4-ethylenedioxylenethiophene)-polystylene sulfonic acid (PEDOT:PSS) and lithium zinc oxide layers were used as a recombination layer. We have used poly(di(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene-co-octylthieno[3,4-c]pyrrole-4,6-dione):[6,6]-phenyl-C61 butyric acid methyl ester (PBDTTPD:PC61BM) and poly[(4,4'-bis(2-ethylhexyl)dithieno[3,2-b:2',3'-d] silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl]:[6,6]-phenyl-C70 butyric acid methyl ester (PSBTBT:PC70BM) as the active layers for front and rear subcells, respectively. The pH-neutral PEDOT:PSS/LZO serves as an electron- and hole-collecting and recombination layer. Our tandem solar cells showed a high open circuit voltage (Voc) of 1.54 V, a short circuit current density (Jsc) of 7.55 mA/cm(2), and a fill factor (FF) of 64.79% along with the power conversion efficiency of 7.53%. The Voc value of our tandem solar cells is an ideal summation of Voc values from front and rear subcells.