A new dialkylthio-substituted naphtho[2,3-c]thiophene-4,9-dione based polymer donor for high-performance polymer solar cells†,Energy & Environmental Science

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A new dialkylthio-substituted naphtho[2,3-c]thiophene-4,9-dione based polymer donor for high-performance polymer solar cells†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-12-21 00:00:00 , DOI: 10.1039/c8ee03608j
Yue Wu _{1,

2,

3} , Hang Yang _{1,

2,

3} , Yan Zou _{1,

2,

3} , Yingying Dong _{1,

2,

3} , Jianyu Yuan _{3,

4} , Chaohua Cui _{1,

2,

3} , Yongfang Li _{1,

2,

3,

5,

6}

Affiliation

Rational molecular design towards high-performance photovoltaic materials with superior large-area capability is critical but still a challenge for the research field of polymer solar cells (PSCs). In this work, we design and synthesize a new dialkylthio-substituted conjugated polymer donor (namely PBN-S) to address this issue. PBN-S shows strong absorbance in the wavelength range of 500–700 nm and has a low-lying HOMO level of −5.48 eV, which matches that of the nonfullerene acceptor IT-4F. Optimized PSCs based on PBN-S:IT-4F demonstrate a high power conversion efficiency (PCE) of 13.10%, benefitting from the efficient charge separation, high and balanced charge mobility, ordered molecular packing and aggregation of the donor and acceptor materials in the active layer. In addition, the PCE of a PBN-S based semitransparent PSC reaches 9.83% with an average visible transmittance of 32%. What is more, remarkable PCEs of 10.21% and 10.69% were realized from spin-coated or blade-coated PSCs with an active area of 100 mm², respectively, indicating the great potential of PBN-S as a donor in high-performance large-area PSC application. More importantly, the PBN-S based devices show excellent shelf-life stability, retaining over 80% of their initial PCE after 100 days storage in a nitrogen-filled glove-box or in air. These results demonstrate the promising capability of PBN-S as a donor material for future PSC applications.

中文翻译：

一种用于高性能聚合物太阳能电池的新型二烷硫基取代的萘并[2,3 - c ]噻吩-4,9-二酮聚合物供体†

对具有卓越大面积能力的高性能光伏材料进行合理的分子设计至关重要，但对于聚合物太阳能电池（PSC）的研究领域仍然是一个挑战。在这项工作中，我们设计并合成了一种新的二烷硫基取代的共轭聚合物供体（即PBN-S）来解决此问题。PBN-S在500-700 nm的波长范围内显示出很强的吸光度，并且其低水平的HOMO能级为-5.48 eV，与非富勒烯受体IT-4F相当。基于PBN-S：IT-4F的优化PSC表现出13.10％的高功率转换效率（PCE），这得益于有效的电荷分离，高且平衡的电荷迁移率，有序的分子堆积以及供体和受体材料在电池中的聚集活动层。此外，基于PBN-S的半透明PSC的PCE达到9。83％的平均可见光透射率为32％。此外，有效面积为100 mm的旋涂或刀片涂层PSC分别实现了10.21％和10.69％的出色PCE。^图2分别表明PBN-S在高性能大面积PSC应用中作为施主的巨大潜力。更重要的是，基于PBN-S的设备显示了出色的保存期限稳定性，在充氮手套箱或空气中存放100天后，保留了其初始PCE的80％以上。这些结果表明，PBN-S作为未来PSC应用的供体材料具有令人鼓舞的功能。

更新日期：2018-12-21

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