2 research outputs found
Solution-Processable Singlet Fission Photovoltaic Devices
We demonstrate the successful incorporation
of a solution-processable
singlet fission material, 6,13-bisÂ(triisopropylsilylethynyl)Âpentacene
(TIPS-pentacene), into photovoltaic devices. TIPS-pentacene rapidly
converts high-energy singlet excitons into pairs of triplet excitons
via singlet fission, potentially doubling the photocurrent from high-energy
photons. Low-energy photons are captured by small-bandgap electron-accepting
lead chalcogenide nanocrystals. This is the first solution-processable
singlet fission system that performs with substantial efficiency with
maximum power conversion efficiencies exceeding 4.8%, and external
quantum efficiencies of up to 60% in the TIPS-pentacene absorption
range. With PbSe nanocrystal of suitable bandgap, its internal quantum
efficiency reaches 170 ± 30%