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Updated: Apr 5, 2026

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Understanding the Halogenation Effects in Diketopyrrolopyrrole-Based Small Molecule Photovoltaics
Shi-Xin Sun1, Yong Huo1, Miao-Miao Li2
1State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, 730000, P. R. China.
Abstract:
Two molecules containing a central diketopyrrolopyrrole and two oligothiophene units have been designed and synthesized. Comparisons between the molecules containing terminal F (FDPP) and Cl (CDPP) atoms allowed us to evaluate the effects of halogenation on the photovoltaic properties of the small molecule organic solar cells (OSCs). The OSCs devices employing FDPP:PC71BM films showed power conversion efficiencies up to 4.32%, suggesting that fluorination is an efficient method for constructing small molecules for OSCs.
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