An optimization of several aspects of planar heterojunction solar cells based on boron subnaphthalocyanine chloride (SubNc) as a donor material is presented. The use of hexachlorinated boron subphthalocyanine chloride (Cl 6SubPc) as an alternative acceptor to C60 allows for the simultaneous increase of the short-circuit current, fill factor, and open-circuit voltage compared to cells with fullerene acceptors. This is due to the complementary absorption of Cl6SubPc versus SubNc, reduced recombination at the heterointerface, and improved energetic alignment. Furthermore, insertion of a thin diindeno[1,2,3-cd:1′,2′,3′- lm]perylene (DIP) layer at the anode results in a very significant 60% increase in photocurrent owing to reduced exciton quenching at the anode. The simultaneous improvement of all three solar cell parameters results in a power conversion efficiency of 6.4% for a non-fullerene planar heterojunction cell. The power conversion efficiency of a planar heterojunction solar cell based on boron subnaphthalocyanine chloride (SubNc) is improved from ηP = 2.8% to 4.4% by inserting diindenoperylene (DIP) at the anode and also to ηP > 6% by the use of a chlorinated subphthalocyanine (Cl 6SubPc) as a non-fullerene acceptor material that increases open-circuit voltage, fill factor, and short-circuit current.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- General Materials Science
- alternative electron acceptors
- chlorinated materials
- organic photovoltaic cells