Publication date: 4th October 2024
Organic solar cells (OSCs) have been regarded as a promising technology for converting renewable solar energy to electricity because of their outstanding advantages such as low cost, light weight, high flexibility, controllable transparency, and large-area solution processability. During the last decade, we focused on the development of N-type near-infrared organic photovoltaic materials to break the efficiency bottleneck of OSCs.[1] We proposed a new design concept, “enhancing the quinoidal resonance of electron donor (D)-electron acceptor (A) systems”, and developed a series of N-type photovoltaic materials (ATT and AQx series) featuring highly adjustable electronic structure by convenient modular synthesis.[2] By developing the precise regulation strategies on electronic[3] and aggregation[4] structures of bulk-heterojunction active layer, we achieved the continuing breakthroughs on the OSC efficiency, and currently a record efficiency over 20% has been realized for single-junction organic solar cells.[5] In order to achieve both high average visible-light transmittance and high power conversion efficiency in semi-transparent solar cells, we proposed the strategy,“near-infrared complementary absorption of electron donor and acceptor materials”, and developed ultra-small bandgap electron acceptor materials, leading to record-high light utilization efficiencies.[6]
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