All-porphyrin organic solar cells. (September 2020)

• Record Type: Journal Article
• Authors: Pan, Xiaojie; Huang, Siyu; Zhu, Bei; Xia, Ruidong; Peng, Xiaobin
• Is Part Of: Dyes and pigments. Volume 180(2020)
• Publication Date: 2020-09
• Subjects: All porphyrin -- Small molecule -- Organic solar cells -- Perylene bisimide -- 1, 4-diketopyrrolo[3, 4-c]pyrroles; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2020.108503
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Four small molecule electron acceptors TEH-PDI, TEH-DPDI, TPDI and TDPDI based on a porphyrin core and perylene bisimides (PDI) units were designed and synthesized. The energy levels and aggregation properties of the four acceptors were tuned to match those of a porphyrin electron donor C19OD-DPP based on a porphyrin core and 1, 4-diketopyrrolo[3, 4-c]pyrroles (DPP) end groups by adjusting the number of PDI units and the connection manners to a porphyrin core synergistically. The all-porphyrin bulk heterojunction (BHJ) solar cells exhibit panchromatic photon-to-current conversion from 300 to 900 nm with a small valley around 650 nm and provide power conversion efficiencies (PCEs) of 0.11%–2.57% when the active layers were prepared in the presence of octane-1, 8-dithiol (ODT) additive. Further investigations show that more balanced hole/electron mobility, less trap-assisted monomolecular recombination and bimolecular recombination are beneficial for achieving higher J sc and PCE for C19OD-DPP/TPDI devices. Graphical abstract: All-porphyrin small molecule OSCs are reported for the first time with panchromatic photon-to-current conversion from 300 to 900 nm with a small valley around 650 nm. Image 1 Highlights: Four small molecule porphyrin electron acceptors were designed and synthesized. Their energy levels can match those of a porphyrin electron donor. The all porphyrins solar cells exhibit PCEs from 0.11% to 2.57%. It's the first time that all-porphyrin OSCs are reported herein.