RT Conference Proceedings
T1 Triplet-charge annihilation in a small molecule donor: acceptor blend as a major loss mechanism in organic photovoltaics
A1 Marín-Beloqui, José Manuel
A1 Casado-Cordón, Juan
K1 Espectroscopía
K1 Células solares
K1 Células fotovoltaicas
AB Organic photovoltaics (OPV) are close to reaching a landmark 20%device efficiency.[1] One of the proposed reasons that OPVs have yet toattain this milestone is their propensity toward triplet formation. In this talk,[2] the small molecule donor, DRCN5T, is studied using avariety of spectroscopy techniques, and blended with both fullerene andnon-fullerene acceptors. Specifically, picosecond and microsecond transientabsorption and Raman spectroscopies are focused on. Despite DRCN5T's abilityto achieve OPV efficiencies of over 10%,[3] it generates an unusually highpopulation of triplets. These triplets are primarily formed in amorphousregions via back recombination from a charge transfer state. As such,triplets have a dual role in DRCN5T device efficiency suppression: they bothhinder free charge carrier formation and annihilate those free charges thatdo form. Using microsecond transient absorption spectroscopy under oxygen conditions,this triplet-charge annihilation (TCA) is directly observed as a generalphenomenon in a variety of DRCN5T: fullerene and non-fullerene blends. SinceTCA is usually inferred rather than directly observed, it is demonstratedthat this technique is a reliable method to establish the presence of TCA.
YR 2022
FD 2022-06-23
LK https://hdl.handle.net/10630/24682
UL https://hdl.handle.net/10630/24682
LA eng
NO Resumen comunicación presentada
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026