A Facile Two-Step Interface Engineering Strategy To Boost the Efficiency of Inverted Ternary-Blend Polymer Solar Cells over 10%,ACS Sustainable Chemistry & Engineering

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A Facile Two-Step Interface Engineering Strategy To Boost the Efficiency of Inverted Ternary-Blend Polymer Solar Cells over 10%
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acssuschemeng.7b01792
Xiaoxiang Sun ₁ , Chang Li ₁ , Jian Ni ₁ , Like Huang ₁ , Rui Xu ₁ , Zhenglong Li ₁ , Hongkun Cai ₁ , Juan Li ₁ , Yaofang Zhang ₂ , Jianjun Zhang ₁

Affiliation

A facile two-step strategy was proposed to modify ZnO nanoparticle electron transfer layer in inverted ternary-blend polymer solar cells (TPSCs) by irradiating the ZnO with UV-ozone (UVO) and then spin-coating on it a poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN) interfacial modification layer. The combination of UVO and PFN showed the advantage of simultaneously passivating the defect states of ZnO to reduce the defect-assisted electron–hole recombination, modifying the surface morphology and hydrophilicity of ZnO to improve the interfacial contact with the active layer, and optimizing the electron transfer characteristic of ZnO to enhance the electron extraction from the active layer to the cathode. As a result, the champion power conversion efficiency of TPSCs with PTB7-Th:PCDTBT:PC₇₀BM as the active layer was increased from 6.80% to 9.61% by 20 min of UVO irradiation and then further increased to 10.87% after the incorporation of an ultrathin PFN interfacial layer. Because of the ease of fabrication and remarkable boost in efficiency, our results indicate that this two-step strategy provides a simple and effective way to fabricate highly efficient inverted PSCs.

中文翻译：

一种简便的两步式界面工程策略，可将倒三元混合聚合物太阳能电池的效率提高10％以上

提出了一种简单的两步策略，通过用紫外线臭氧（UVO）辐照ZnO，然后在其上旋涂聚[[9， 9-双（3'-（N，N-二甲基氨基）丙基）-2,7-芴）-alt-2,7-（9,9-二辛基芴）]（PFN）界面改性层。UVO和PFN的组合具有以下优点：同时钝化ZnO的缺陷状态，以减少缺陷辅助的电子-空穴复合，改变ZnO的表面形态和亲水性，以改善与活性层的界面接触，并优化电子。 ZnO的转移特性，以增强电子从活性层到阴极的提取。结果，采用PTB7-Th：PCDTBT：PC ₇₀的TPSC的最佳功率转换效率在20分钟的UVO照射下，作为活性层的BM从6.80％增加到9.61％，然后在掺入超薄PFN界面层后进一步增加到10.87％。由于易于制造和效率的显着提高，我们的结果表明，这种两步策略为制造高效的反向PSC提供了一种简单有效的方法。

更新日期：2017-09-21

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