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High-Efficiency All Polymer Solar Cell with a Low Voltage Loss of 0.56 V
journal contribution
posted on 2018-05-09, 00:00 authored by Xiaofeng Chen, Mingzhi Zhao, Zhi-guo Zhang, Yongfang Li, Xiaoyu Li, Haiqiao WangReducing voltage
loss, namely, Vloss, has been demonstrated
to be an effective way to improve the efficiencies of photovoltaic
devices, and power conversion efficiencies (PCEs) exceeding 10% have
been reported in non-fullerene based polymer solar cells (PSCs) with Vloss value lower than 0.6 V. However, for all
polymer solar cells (APSCs), the PCEs lag far behind the non-fullerene
PSCs with organic small molecular acceptors. And there have been no
successful examples of high-efficiency APSCs along with low Vloss values so far. Here, we reported APSCs
that demonstrated a high efficiency of 6.66% simultaneously with a
small voltage loss of 0.56 V by using a new polymer PBDT-DFQX1 as
donor and N2200 as acceptor. Notably, when PBDT-DFQX1 is combined
with a small molecular acceptor (SMA) O-IDTBR, the relative SMA based
PSC exhibited a higher PCE of 8.76% also with a low voltage loss of
0.56 V. These results indicated that PBDT-DFQX1 would be a promising
polymer donor material in photovoltaic device application, and the
strategy by minimizing the voltage loss to improve the photovoltaic
efficiencies is still valid for APSCs.