Proses Produksi Dan Pengemasan Yoghurtdicv. Cita Nasional Salatiga

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Molecular Engineering for Large Open-Circuit Voltage and Low Energy Loss in Around 10% Non-fullerene Organic Photovoltaics

Recent efforts in organic photovoltaics (OPVs) have been devoted to obtaining low-bandgap non-fullerene acceptors (NFAs) for high photocurrent generation. However, the low-lying lowest unoccupied molecular orbital (LUMO) level in narrow bandgap NFAs typically results in a small energy difference (Δ<i>E</i>_DA) between the LUMO of the acceptor and the highest occupied molecular orbital (HOMO) of the donor, leading to low open-circuit voltage (<i>V</i>_OC). The trade-off between Δ<i>E</i>_DA and photocurrent generation significantly limits the simultaneous enhancement of both <i>V</i>_OC and short-circuit current density (<i>J</i>_SC). Here, we report a new medium-bandgap NFA, IDTT-T, containing a weakly electron-withdrawing <i>N</i>-ethyl thiabarbituric acid terminal group on each end of the indacenodithienothiophene (IDTT) core. When paired with a benchmark low-bandgap PTB7-th polymer donor, simultaneous enhancement of both Δ<i>E</i>_DA and absorption spectral coverage was realized. The OPV devices yield a <i>V</i>_OC of 1.01 V, corresponding to a low energy loss of 0.57 eV in around 10% efficiency single-junction NFA OPVs. The design demonstrates a working principle to concurrently increase Δ<i>E</i>_DA and photocurrent generation for high <i>V</i>_OC and PCE in bulk fullerene-free heterojunction OPVs