Improved Performance of Polymer Solar Cells by Thermal Evaporation of AgAl Alloy Nanostructures into the Hole-Transport Layer.
The performance characteristics of polymer solar cells (PSCs) incorporated with AgAl and Ag nanostructures and MoO3spacer layers were investigated. The power conversion efficiency (PCE) of PSCs is sensitive to the nominal thicknesses of the AgAl nanostructures and the MoO3spacer layer. The PCE of a PSC with a 3-nm-thick layer of AgAl nanostructures and a 1-nm-thick MoO3isolation layer reached 9.79%, which is higher than the PCE (8.55%) of the reference PSC without metal nanostructures. Compared to PSCs with Ag nanostructures, PSCs with AgAl nanostructures showed better stability and still retained 60% of their initial PCE values after aging for 120 days in air without encapsulation. The enhanced stability of the PSCs is attributed to the formation of AlOx, which can inhibit the diffusion of Ag atoms into the neighboring layer. The localized surface plasmonic resonance (LSPR) effect of AgAl nanostructures was retained by inserting an only 1-nm-thick MoO3spacer layer between the metal nanostructures and the metal electrode. Our work has demonstrated that using AgAl alloy instead of Ag as plasmonic nanostructures is a better strategy for improving the performance of PSCs, especially in terms of the stability of the cells.
Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, and School of Physics and Materials Science, East China Normal University , Shanghai 200062, China.
Jinfeng
J
Wang
Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, and School of Physics and Materials Science, East China Normal University , Shanghai 200062, China.
Xiangkun
X
Jia
School of Automation Engineering, Shanghai University of Electric Power , Shanghai 200090, China.
Jianping
J
Zhou
Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, and School of Physics and Materials Science, East China Normal University , Shanghai 200062, China.
Likun
L
Pan
Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, and School of Physics and Materials Science, East China Normal University , Shanghai 200062, China.
Sumei
S
Huang
Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, and School of Physics and Materials Science, East China Normal University , Shanghai 200062, China.
Xiaohong
X
Chen
AgAl alloy; local surface plasmonic resonance; metal nanoparticles; polymer solar cells; stability