Regioselective functionalization of perylenes reduces voltage loss in organic solar cells

The power conversion efficiencies of organic solar cells (OSCs) based on blends of electron donor (D) and acceptor (A) semiconducting materials now exceed 16%. However, it is still lower than that of highly efficient inorganic SCs such as GaAs and perovskite.

The charge generation efficiency in OSCs nowadays is nearly 100%, thus reducing the energy loss in output voltage is critically important for further enhancing the efficiency of OSCs. Group of Assistant Professor Seiichiro Izawa and Professor Masahiro Hiramoto at Institute for Molecular Science and Professor Masaki Takahashi and Assistant Professor Keisuke Fujimoto at Shizuoka University in Japan report that regioselective bay-functionalization of perylene derivatives and the use of the synthesized PDI as an acceptor material reduces the open-circuit voltage loss in OSCs.

PDI, a promising candidate as a superior non-fullerene acceptor material for OSCs, has attracted tremendous attention due to the highly efficient charge-carrier properties. However, it has been still difficult to synthesize custom-designed PDIs with high efficiency and desired regioselectivity.

Reserchers developed regioselective bay-functionalization of PDI by using their original synthetic protocol of highly controllable monobromination of peryrene tetracarboxylate. The bay functionalization by electron donating groups lifted LUMO level of synthesized tetrasubstituted PDI. The use of the synthesized compound as an acceptor material of OSC increased open-circuit voltage as 0.25 V than non-substituted PDI.

The origin of the high VOC was that bay-functionalization liftes LUMO level, leading to the reduction of the energy offset for charge separation and non-radiative recombination loss that is the most important topic in OSC field nowadays.

The results will open up new aveneues for future development of potential PDI-based acceptor materials through the tailor-made synthesis of bay-functionalized PDIs for efficient OSCs.

Research paper

Related Links
National Institutes Of Natural Sciences

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SOLAR DAILY
Hungarian 150MW solar power plant project obtains $125m investment proposal

Orlando FL (SPX) Feb 07, 2020

With the EU raising the price of lignite in an effort to reduce greenhouse gases and fight against climate change, the Hungarian government has decided to turn toward renewable energy as a source of power. With a view to increasing solar panels from 500MW to 30,000MW by 2022, Hungary is seeking to step away from coal and other fossil fuels towards more sustainable energy sources. The 150MW (megawatt) project will be split into three groundmounted 50MW solar plants in targeted areas of the country … read more


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