Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Tetrabenzoporphyrin (BP) is one of the prominent p-type materials for organic photovoltaics (OPV). However, BP has two main problems as a p-type material for OPV in case of using PC61BM as an n-type material. Firstly, BP doesn’t have absorption bands over 700 nm, so if we allow BP to have absorption bands in this region, the short-circuit current density (JSC) of OPV will be improved. Secondly, highest occupied molecular orbital (HOMO) level of BP (–4.9 eV) is higher than ideal HOMO levels (–5.2 to –5.4 eV) in combination with PC61BM. So, if the HOMO level of BP is lower, the open-circuit voltage (VOC) of OPV will be improved since the VOC of OPV is proportional to the energy gap between the HOMO level of p-type material and the LUMO level of n-type materials. In this regard, we designed and synthesized diketopyrrolopyrrole (DPP)-linked tetrabenzoporphyrins (Cn-DPP-BPs, n = length of alkyl chains) that have different length of alkyl chains on DPP units. Cn-DPP-BPs showed broader absorption spectra in visible to near infrared light regions and covered over 700 to 900 nm. Furthermore, HOMO levels of Cn-DPP-BPs were 0.1 eV lower than that of BP. We fabricated bulk hetrojunction (BHJ)-type OPVs of Cn-DPP-BP and PC61BM to find that performance of OPVs is strongly depended on the length of alkyl chains. After optimizing the fabrication conditions, a combination with C4-DPP-BP and PC61BM showed the best power conversion efficiency (PCE) of 5.24% and the JSC and VOC were improved compared to those of BP/PC61BM devices. We will report the morphology and molecular orientations of BHJ-films.
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