Nanocrystal Growth and Improved Performance of Small Molecule Bulk Heterojunction Solar Cells Composed of a Blend of Chloroaluminum Phthalocyanine and C-70

作者：Harada Kentaro; Edura Tomohiko; Adachi Chihaya^*

来源：Applied Physics Express, 2010, 3(12): 121602.

DOI：10.1143/APEX.3.121602

Improved performance from organic bulk heterojunction (BHJ) solar cells composed of a blend of chloroaluminum phthalocyanine (ClAlPc) and fullerene C-70 is demonstrated. The deep highest occupied molecular orbital of ClAlPc and the broad absorption of C70 lead to a high open-circuit voltage and a high short-circuit current density (JSC). A change in the intermolecular arrangement of ClAlPc is observed when the substrate is heated to 370-390 K during deposition of the blend layer, indicating the growth of pi-stacked nanocrystals of ClAlPc. Consequently, JSC and the fill factor are enhanced significantly, and a high power conversion efficiency of 4.1% is obtained.

• 出版日期2010