Abstract:

Organic solar cells with the structure of ITO/PEDOT: PSS/P3HT+PCBM/LiF/Al were prepared and the device performances
under different annealing conditions were studied. The result showed that ① the devices performed better when annealing after 50
minutes in the temperature range of 140-160 ℃ than those in other annealing temperature range. The optimal device showed a short
circuit current density and energy conversion efficiency was 6.57 mA/cm2 and 2.12% respectively; ② when 150 ℃ annealing temperature
was chosen, the devices showed a better performance from 40 to 60 minutes than those in other annealing time. The top short circuit
current density and energy conversion efficiency reached 6.608 mA/cm2 and 2.13% respectively; ③ when the optimal annealing time
and temperature were adopted based on ① and ②, the short circuit current density and energy conversion efficiency of the optimal
device were obviously improved to 7.22 mA/cm2 and 2.33%respectively. Annealing under combination conditions was an effective
approach to device optimization.

Key words: organic solar cell, annealing, temperature, time, power conversion efficiency