Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
In conjugated organic semiconductors such as tetracene, the absorption of one high energy photon leads to the splitting of one singlet exciton into two triplet excitons, each having about half the energy of the original singlet exciton (reference). When combined with a semiconductor with a bandgap equal to about half the bandgap of the SF layer, the resulting solar device could effectively challenge the Shockley-Quaisser limit with a single junction solar cell. To date, the transfer of triplet excitons from the SF layer to the underlying low-bandgap semiconductor has proven to constitute the bottleneck of a successful utilisation of SF for photovoltaic purposes. Our work provides an evidence for the triplet transfer from tetracene to silicon to occur upon exposure of our solar device to ambient conditions, as indicated by magnetic field-dependent photocurrent measurements and further confirmed by photoluminescence decay measurements. In addition, changes in XRD spectra of the tetracene layer upon prolonged exposure to air suggest conversion of polycrystalline tetracene from polymorph I (Tc I) to polymorph II (Tc II). Therefore, we propose the evolution of tetracene polymorphism as the triggering factor of the observed triplet transfer in our solar cells.
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