Multifolded polymer solar cells on flexible substrates

Arrays of reflective multijunction polymer solar cell were demonstrated by folding four separated cells fabricated on a single plastic substrate using conducting polymer poly(3, 4-ethylene-dioxythiophene):polystyrenesulfonate as an anode. The combination of flexible substrate and polymer solar cells (PSCs) makes the construction of multifolded PSCs on one substrate possible. The power conversion efficiency (PCE) of the multifolded reflective PSCs was enhanced by 62% +/- 12% with the folded opening angle of 30 degrees compared to the planar cells. In series connection of four solar cells, an open-circuit voltage (V-oc) of 3.65 V was obtained. (C) 2008 American Institute of Physics.