Layer-by-layer (LL) process has great potential in achieving high-performance polymersolar cells (PSCs) due to its advantage in realizing p-i-n like structure. LL method is attracting more and more interests in fabricating PSCs, and power conversion efficiency (PCE) of LL processed PSCs has been greatly improved to over 5% recently. In this paper, by employing LL approach, we fabricated polymerphotovoltaic devices with poly(3-hexylthiophene) (P3HT) as donor and four different fullerenes as acceptor. PCE of 6.48% was achieved. Performances of the LL processed devices are comparatively better than that of their corresponding traditional bulk-heterojunction devices.
Received 19 September 2012Accepted 13 December 2012Published online 26 December 2012
The authors acknowledge the financial support by 973 Program (Grant Nos. 2011CB932304), the National Natural Science Foundation of China (Grant Nos. 61072014 and 21021091) and Hundred-Talent Program of Chinese Academy of Sciences.