16.52% Efficiency All-Polymer Solar Cells with High Tolerance of the Photoactive Layer Thickness,Advanced Materials

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16.52% Efficiency All-Polymer Solar Cells with High Tolerance of the Photoactive Layer Thickness
Advanced Materials ( IF 27.4 ) Pub Date : 2022-03-15 , DOI: 10.1002/adma.202108749
Wenqing Zhang ₁ , Chenkai Sun ₁ , Indunil Angunawela ₂ , Lei Meng _{3,

4} , Shucheng Qin _{3,

4} , Liuyang Zhou _{3,

4} , Shaman Li ₄ , Hongmei Zhuo _{3,

4} , Guang Yang ₁ , Zhi-Guo Zhang ₅ , Harald Ade ₂ , Yongfang Li _{3,

4,

6}

Affiliation

All-polymer solar cells (all-PSCs) have drawn growing attention and achieved tremendous progress recently, but their power conversion efficiency (PCE) still lags behind small-molecule-acceptor (SMA)-based PSCs due to the relative difficulty on morphology control of polymer photoactive blends. Here, low-cost PTQ10 is introduced as a second polymer donor (a third component) into the PM6:PY-IT blend to finely tune the energy-level matching and microscopic morphology of the polymer blend photoactive layer. The addition of PTQ10 decreases the π–π stacking distance, and increases the π–π stacking coherence length and the ordered face-on molecular packing orientation, which improves the charge separation and transport in the photoactive layer. Moreover, the deeper highest occupied molecular orbital energy level of the PTQ10 polymer donor than PM6 leads to higher open-circuit voltage of the ternary all-PSCs. As a result, a PCE of 16.52% is achieved for ternary all-PSCs, which is one of the highest PCEs for all-PSCs. In addition, the ternary devices exhibit a high tolerance of the photoactive layer thickness with high PCEs of 15.27% and 13.91% at photoactive layer thickness of ≈205 and ≈306 nm, respectively, which are the highest PCEs so far for all-PSCs with a thick photoactive layer.

中文翻译：

16.52% 效率的全聚合物太阳能电池，具有高光敏层厚度公差

全聚合物太阳能电池（all-PSCs）近年来受到越来越多的关注并取得了巨大的进展，但由于形态控制相对困难，其功率转换效率（PCE）仍然落后于基于小分子受体（SMA）的PSCs聚合物光活性共混物。在这里，将低成本 PTQ10 作为第二聚合物供体（第三组分）引入 PM6:PY-IT 共混物中，以微调聚合物共混物光活性层的能级匹配和微观形态。PTQ10的加入减小了π-π堆积距离，增加了π-π堆积相干长度和有序的正面分子堆积取向，从而改善了光敏层中的电荷分离和传输。而且，PTQ10聚合物供体比PM6更深的最高占据分子轨道能级导致三元全PSC的开路电压更高。因此，三元全 PSC 的 PCE 为 16.52%，是全 PSC 的最高 PCE 之一。此外，三元器件表现出对光敏层厚度的高耐受性，在 ≈205 和 ≈306 nm 的光敏层厚度下，PCE 分别为 15.27% 和 13.91%，这是迄今为止全 PSC 的最高 PCE。厚的光敏层。

更新日期：2022-03-15

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