Over 17% efficiency ternary organic solar cells enabled by two non-fullerene acceptors working in an alloy-like model,Energy & Environmental Science

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Over 17% efficiency ternary organic solar cells enabled by two non-fullerene acceptors working in an alloy-like model
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020/01/14 , DOI: 10.1039/c9ee03710a
Lingling Zhan _{1,

2,

3,

4,

5} , Shuixing Li _{1,

2,

3,

4,

5} , Tsz-Ki Lau _{6,

7,

8,

9,

10} , Yong Cui _{10,

11,

12,

13} , Xinhui Lu _{6,

7,

8,

9,

10} , Minmin Shi _{1,

2,

3,

4,

5} , Chang-Zhi Li _{1,

2,

3,

4,

5} , Hanying Li _{1,

2,

3,

4,

5} , Jianhui Hou _{10,

11,

12,

13} , Hongzheng Chen _{1,

2,

3,

4,

5}

Affiliation

Nowadays, organic solar cells (OSCs) with Y6 and its derivatives as electron acceptors provide the highest efficiencies among the studied binary OSCs. To further improve the performances of OSCs, the fabrication of ternary OSCs (TOSCs) is a convenient strategy. Essentially, morphology control and the trade-off between voltage and photocurrent are the main critical issues in TOSCs. Herein, we address these problems by constructing TOSCs where an alloy-like composite is formed between Y6 and a newly designed derivative, BTP-M. Employing an electron-pushing methyl substituent as a replacement for the electron-withdrawing F atoms on Y6, BTP-M shows higher energy levels and lower crystallinity than Y6. As a result, the obtained Y6:BTP-M alloy can simultaneously optimize energy levels to reduce energy loss as well as the morphologies of the active layers to favor photocurrent generation, leading to an enhanced open-circuit voltage (V_oc) of 0.875 V together with a larger short-circuit current density (J_sc) of 26.56 mA cm⁻² for TOSCs based on the polymer donor PM6 and Y6:BTP-M acceptor alloy. Consequently, a best efficiency of 17.03% is achieved for the corresponding TOSCs, which is among the best values for single-junction OSCs. In addition, our TOSCs also exhibit good thickness tolerance, and can reach 14.23% efficiency even though the active layer is as thick as 300 nm.

中文翻译：

由两个非富勒烯受体以类似合金的模型工作，使三元有机太阳能电池的效率提高了17％

如今，在研究的二元OSC中，以Y6及其衍生物作为电子受体的有机太阳能电池（OSC）效率最高。为了进一步提高OSC的性能，三元OSC（TOSC）的制造是一种方便的策略。本质上，形态控制和电压与光电流之间的权衡是TOSC中的主要关键问题。本文中，我们通过构建TOSC来解决这些问题，在TOSC中，Y6与新设计的衍生物BTP-M之间形成了合金状复合物。与Y6相比，使用推电子的甲基取代基代替Y6上吸电子F原子，BTP-M具有更高的能级和更低的结晶度。结果，获得的Y6：对于基于聚合物供体PM6和Y6：BTP-M受体合金的TOSC，TOC为0.875 V的V _oc）和26.56 mA cm ^-2的更大的短路电流密度（J _sc）。因此，相应的TOSC的最佳效率为17.03％，这是单结OSC的最佳值之一。此外，即使有源层的厚度达到300 nm，我们的TOSC仍具有良好的厚度公差，效率可达到14.23％。

更新日期：2020-02-19

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