Improved efficiency of inverted organic solar cells using organic hole collecting interlayer

The device performances of inverted organic solar cells were improved by using hexaazatriphenylene-hexacarbonitrile (HAT-CN) as the organic interlayer for hole collection at the anode. The HAT-CN was effective to enhance the open circuit voltage and fill factor of the inverted organic solar cells by forming good interfacial contact with Al anode in inverted organic solar cells. The power conversion efficiency of the organic solar cells was improved from 0.36% to 2.09% by the HAT-CN hole collecting organic interlayer.