Tandem solar cells have the potential to improve photon conversion efficiencies (PCEs) beyond the limits of single-junction devices. In this study, a triple-junction tandem design is demonstrated by employing three distinct organic donor materials having bandgap energies ranging from 1.4 to 1.9 eV. Through optical modeling, balanced photon absorption rates are achieved and, thereby, the photo-currents are matched among the three subcells. Accordingly, an efficient triple-junction tandem organic solar cell can exhibit a record-high PCE of 11.5%.
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Luminance-current characteristics of organic electroluminescent
devices based on the europium complex of europium(dibenzoylmethanato)3
(bathophenanthroline) (Eu(DBM)3bath) have been investigated. Transient
measurements were carried out to study the decay process of excited
Eu3+ ions. A comparison of experimental data and theoretical
calculation shows that biexcitonic quenching among the excited Eu3+
ions is an important channel in their decay process, and this quenching
process is a primary cause for our observation of a rapid decrease in
quantum efficiency with increasing current density. Extending the
recombination zone is found to be beneficial to reducing this defective
effect. The mechanism of the quenching process is also
discussed.
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