Manipulating the solubility properties of polymer donors for high-performance layer-by-layer processed organic solar cells,Energy & Environmental Science

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Manipulating the solubility properties of polymer donors for high-performance layer-by-layer processed organic solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-08-31 , DOI: 10.1039/d1ee01336j
Haijun Ning ₁ , Qiuju Jiang ₁ , Pengwei Han ₁ , Man Lin ₁ , Gongya Zhang ₁ , Jinming Chen ₁ , Hui Chen ₂ , Shuyi Zeng ₁ , Jinping Gao ₁ , Jiangang Liu ₁ , Feng He ₂ , Qinghe Wu ₁

Affiliation

High-performance polymer donors are highly demanded to fulfil the potential of layer-by-layer (LBL) processed organic solar cells (OSCs). In this study, we present an effective method to develop high-performance polymer donors for LBL-OSCs by manipulating their solubility properties. The solubility of naphthalenothiophene imide (NTI)-based polymers could be easily manipulated by employing linear or branched alkyl chains in NTI. The polymer PNTB6-Cl with linear alkyl chains insoluble in chloroform could tolerate the chloroform processing by washing away the polymers only in the amorphous region, resulting in an LBL film with a much smoother surface and more efficient photoluminescence quenching, while chloroform-soluble polymer PNTB-Cl did not. PNTB6-Cl:N3 based LBL devices exhibited an efficiency of 17.59%, much higher than 15.24% for PNTB-Cl:N3 based devices and 16.20% for control devices based on PM6:N3. Importantly, the excellent batch-to-batch reproducibility of PNTB6-Cl overcomes the notorious batch-dependent issue in polymer donors, indicating that PNTB6-Cl is a promising polymer donor for LBL-OSCs. Our studies demonstrate that the solubility property of a polymer could significantly impact electron acceptor penetration, phase separation and photovoltaic performance of LBL-OSCs, which provide the guidelines for high-performance polymer donor design.

中文翻译：

操纵聚合物供体的溶解特性，用于高性能逐层处理的有机太阳能电池

非常需要高性能聚合物供体来实现逐层 (LBL) 处理的有机太阳能电池 (OSC) 的潜力。在这项研究中，我们提出了一种有效的方法，通过操纵溶解度特性来开发 LBL-OSC 的高性能聚合物供体。通过在 NTI 中使用直链或支链烷基链，可以轻松控制基于萘并噻吩酰亚胺 (NTI) 的聚合物的溶解度。具有不溶于氯仿的线性烷基链的聚合物 PNTB6-Cl 可以通过仅洗去无定形区域的聚合物来耐受氯仿加工，从而产生具有更光滑表面和更有效的光致发光猝灭的 LBL 薄膜，而可溶于氯仿的聚合物 PNTB -Cl 没有。基于 PNTB6-Cl:N3 的 LBL 器件的效率为 17.59%，远高于 PNTB-Cl 的 15.24%：基于 N3 的设备和基于 PM6:N3 的控制设备的 16.20%。重要的是，PNTB6-Cl 出色的批次间重现性克服了聚合物供体中臭名昭著的批次依赖性问题，表明 PNTB6-Cl 是 LBL-OSC 的有前途的聚合物供体。我们的研究表明，聚合物的溶解性会显着影响 LBL-OSC 的电子受体渗透、相分离和光伏性能，为高性能聚合物供体设计提供指导。

更新日期：2021-09-22

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