1 research outputs found
Solution-Processed Tungsten Oxide as an Effective Anode Buffer Layer for High-Performance Polymer Solar Cells
WO<sub>3</sub> is an effective anode buffer layer to
substitute
PEDOT:PSS in both organic light-emitting diodes and polymer solar
cells (PSCs). However, the vacuum deposition of the WO<sub>3</sub> layer is not compatible with low-cost solution-processing technology
for the roll-to-roll fabrication of PSCs. Here, we report, for the
first time, a solution-processed WO<sub>3</sub> (s-WO<sub>3</sub>)
anode buffer layer that was prepared by spin-coating tungstenÂ(VI)
isopropoxide solution on an ITO electrode and then thermal annealing
at 150 °C for 10 min in air, for the application in PSCs. The
s-WO<sub>3</sub> layer shows a high hole mobility of 9.4 × 10<sup>–3</sup> cm<sup>2</sup>/V·s and high light transmittance.
The photovoltaic performance of the buffer layer was investigated
by fabricating the PSCs based on polyÂ(3-hexylthiophene) (P3HT) as
a donor and (6,6)-phenyl-C<sub>61</sub>-butyric acid methyl ester
(PC<sub>60</sub>BM), (6,6)-phenyl-C<sub>71</sub>-butyric acid methyl
ester (PC<sub>70</sub>BM), indene-C<sub>60</sub> bisadduct (IC<sub>60</sub>BA), or indene-C<sub>70</sub> bisadduct (IC<sub>70</sub>BA)
as an acceptor. The PSCs with the s-WO<sub>3</sub> anode buffer layer
show enhanced photovoltaic performance in comparison with the devices
with PEDOT:PSS as the anode buffer layer. The power conversion efficiency
of the PSC based on P3HT/IC<sub>70</sub>BA with the s-WO<sub>3</sub> anode buffer layer reached 6.36% under the illumination of AM 1.5G,
100 mW/cm<sup>2</sup>. The results indicate that s-WO<sub>3</sub> is
a promising solution-processable anode buffer layer material for high-efficiency
PSCs and for the fabrication of flexible PSCs