In this work, we reported efficient polymer solar cells with balanced hole/electron mobilities tuned by the acceptor content in bulk heterojunction blend films. The photovoltaic cells were fabricated with two new wide band-gap D-A polymers PBDDIDT and PBDDIDTT as the donor material. The molecular conformations of new polymers are carefully evaluated by theoretical calculations. The results of photovoltaic studies show that two devices reach their optimal conditions with rich PC₇₁BM content up to 80% in blend films, which is uncommon with most of reported PSCs. The as-cast devices based on PBDDIDT and PBDDIDTT reveal good photovoltaic performance with PCE of 7.04% and 6.40%, respectively. The influence of PC₇₁BM content on photovoltaic properties is further detailed studied by photoluminescence emission spectra, charge mobilities and heterojunction morphology. The results exhibit that more efficient charge transport between donor and acceptor occurs in rich PC₇₁BM blend films. Meanwhile, the hole and electron mobilities are simultaneously enhanced and afford a good balance in rich PC₇₁BM blend films (D/A, 1:4) which is critical for the improvement of current density and fill factors.

在这项工作中，我们报道了高效的聚合物太阳能电池，其空穴/电子迁移率受到整体异质结共混膜中受体含量的调节。用两种新型宽带隙DA聚合物PBDDIDT和PBDDIDTT作为供体材料制造了光伏电池。通过理论计算仔细评估了新聚合物的分子构象。光伏研究的结果表明，两种设备达到了最佳条件，混合膜中的PC ₇₁ BM含量高达80％，这在大多数报道的PSC中并不常见。基于PBDDIDT和PBDDIDTT的铸态设备显示出良好的光伏性能，PCE分别为7.04％和6.40％。PC ₇₁的影响通过光致发光发射光谱，电荷迁移率和异质结形态进一步详细研究了BM含量对光伏性能的影响。结果表明，在富PC ₇₁ BM共混膜中，供体和受体之间的电荷传输效率更高。同时，空穴迁移率和电子迁移率同时提高，并在富PC ₇₁ BM共混膜（D / A，1：4）中提供了良好的平衡，这对于改善电流密度和填充因子至关重要。