| dc.description.abstract | Recently,due to the raising in the environmental concern and the dwindling of the fossil fuel reserves, looking for other alternative energy sources become an important activity, Polymer solar cells (PSCs) is one of the possible energy resources under extensively studied,due to the diversity in material use,possible large-scale production through solution processing,and can be flexibility and thus subject to extensive research,Ladder type polymer with planer skeleton and expanded π-conjugated system,will have small energy gap and high carrier mobility for using as P-type material in PSC,Furthermore, it has been reported that polyethyl-enimine ethoxylated (PEIE) can apply as an electron transport layer to improve the power conversion efficiency of the cell.In this study I used three Ladder type polymers as the P-type polymer donor,PCBM as an N-type material to fabricate inverted organic solar cells, Extra PEIE layer was also added inbetween the electron transfer layer and the active layer, The results shows that when thiophene-thiophene-pyrrole ladder polymer was used as p-type, the P / N ratio of the active layer is 1: 2, thermal annealing temperature is 120 degrees, the resulting active film has proper morphology and high hole mobility of 3.39 × 10-3 cm2V-1s-1, Therefore, the corresponding inverted PSC has the highest photocurrent density of 14.28 mA/cm2 and power conversion efficiency of 6.04%. | en_US |