TY - JOUR
T1 - When the Triplet State Doesn’t Matter
T2 - Insights into Its Impact on VOC
AU - Shadabroo, Mohammad Saeed
AU - Tokmoldin, Nurlan
AU - Shukla, Atul
AU - Patterson, Acacia
AU - Melody, Tanner M.
AU - Alqahtani, Obaid
AU - Collins, Brian A.
AU - Neher, Dieter
AU - Shoaee, Safa
N1 - Publisher Copyright:
© 2025 The Authors. Published by American Chemical Society.
PY - 2025/5/9
Y1 - 2025/5/9
N2 - Organic solar cell efficiency, exceeding 20%, is limited by recombination losses from singlet and triplet charge-transfer (CT) states and local triplet excitons, impacting open-circuit voltage (VOC). Using PM6:o-IDTBR, a very low nonradiative voltage loss, ΔVnr = 160 mV, is achieved, despite the presence of triplet excitons (6 × 1015 cm-3). In employing the present system as a model exemplar, we elucidate the circumstance wherein, if the triplet lifetime surpasses the lifetime of the CT decay, the dissociation of triplet excitons to the CT state emerges as a feasible process. This, in turn, serves to reduce the manifestation of an additional loss channel from the T1 state and minimizes losses from T1. In PM6:o-IDTBR, the long triplet lifetime (10 μs) enables dissociation of the triplet state and limits the triplet-mediated recombination to ∼10%.
AB - Organic solar cell efficiency, exceeding 20%, is limited by recombination losses from singlet and triplet charge-transfer (CT) states and local triplet excitons, impacting open-circuit voltage (VOC). Using PM6:o-IDTBR, a very low nonradiative voltage loss, ΔVnr = 160 mV, is achieved, despite the presence of triplet excitons (6 × 1015 cm-3). In employing the present system as a model exemplar, we elucidate the circumstance wherein, if the triplet lifetime surpasses the lifetime of the CT decay, the dissociation of triplet excitons to the CT state emerges as a feasible process. This, in turn, serves to reduce the manifestation of an additional loss channel from the T1 state and minimizes losses from T1. In PM6:o-IDTBR, the long triplet lifetime (10 μs) enables dissociation of the triplet state and limits the triplet-mediated recombination to ∼10%.
UR - https://www.scopus.com/pages/publications/105003591182
U2 - 10.1021/acsenergylett.5c00384
DO - 10.1021/acsenergylett.5c00384
M3 - Article
AN - SCOPUS:105003591182
SN - 2380-8195
VL - 10
SP - 2419
EP - 2427
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 5
ER -
