The maximum theoretical efficiency of conventional solar cells is ~33% as initial outlined by the Schockely-Queisser limit. Singlet fission—splitting a high energy photon into multiple low energy photons/electrons—is an intriguing strategy to circumvent the Shockely-Queisser limit and increase the maximum theoretical solar cell efficiencies to above 45%. In this work we investigate the efficiency of singlet fission of a diphenylisobenzofuran (DPIBF) derivative on nanocrystalline ZrO<sub>2</sub> films. The evolution of the singlet and triplet bands is followed with broadband time resolved spectroscopy, with the assignment based on experiments in solution. The monitored singlet band lies at 650 nm and the triplet band lies at 460 nm. For triplet yield determination, single value decomposition (SVD) is used to look at individual species allowing the separation of contribution from ground state absorption, excited singlet absorption and residual stimulated emission.

Ultrafast time-resolved dynamics of singlet fission in diphenylisobenzofuran derivative on film

255th National Meeting (2018)

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