Weak Makes It Powerful: The Role of Cognate Small Molecules as an Alloy Donor in 2D/1A Ternary Fullerene Solar Cells for Finely Tuned Hierarchical Morphology in Thick Active Layers,Small Methods

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Weak Makes It Powerful: The Role of Cognate Small Molecules as an Alloy Donor in 2D/1A Ternary Fullerene Solar Cells for Finely Tuned Hierarchical Morphology in Thick Active Layers
Small Methods ( IF 10.7 ) Pub Date : 2020-01-21 , DOI: 10.1002/smtd.201900766
Qunping Fan ₁ , Tao Liu ₂ , Ming Zhang ₃ , Wenyan Su _{1,

4} , Ulises A. Méndez‐Romero ₁ , Tao Yang ₅ , Xinjian Geng ₁ , Lintao Hou ₄ , Donghong Yu _{6,

7} , Feng Liu _{3,

8} , He Yan ₂ , Ergang Wang _{1,

9}

Affiliation

Department of Chemistry and Chemical EngineeringChalmers University of Technology Göteborg SE‐412 96 Sweden
Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & ReconstructionHong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong
Department of Physics and AstronomyShanghai Jiaotong University Shanghai 200240 China
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsGuangzhou Key Laboratory of Vacuum Coating Technologies and New Energy MaterialsSiyuan LaboratoryDepartment of PhysicsJinan University Guangzhou 510632 China
Key Laboratory of BiofuelsQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Qingdao 266000 China
Department of Chemistry and BioscienceAalborg University Aalborg East Aalborg DK‐9220 Denmark
Sino‐Danish Center for Education and Research Aarhus DK‐8000 Denmark
Beijing National Laboratory for Molecular Sciences Beijing 100190 China
School of Materials Science and EngineeringZhengzhou University Zhengzhou 450001 China

Herein, a novel small molecule donor is first developed, FSM6, which is a cognate molecule to BTR possessing similar molecular structure with comparable optical absorption but different crystallinity. The efficient fullerene‐type ternary small molecular solar cells (SMSCs) based on an alloy donor of BTR and FSM6 in a thick film of 250 nm reveal the improved hierarchical phase separation morphology and molecular structural order of ternary active layers with improved crystallinity of the key donor component BTR. Furthermore, FSM6 as the key third component also plays a role of charge transfer accelerator in ternary SMSCs. As a result, the optimal ternary SMSCs based on BTR:FSM6:PC₇₁BM achieve a high power conversion efficiency (PCE) up to 10.21% with the synergistically improved open‐circuit voltage of 0.950 V, short‐circuit current density of 13.85 mA cm⁻², and fill factor of 77.6%, in comparison with either the binary SMSCs of BTR:PC₇₁BM (PCE = 9.37%) or FSM6:PC₇₁BM (PCE = 8.00%). This work provides a promising methodology to optimize device morphology for high‐performance ternary SMSCs by combining two cognate small molecules with similar absorption spectra but different crystallinity as an alloy donor.

中文翻译：

弱使它强大：同源小分子在2D / 1A三元富勒烯太阳能电池中作为合金供体的作用，用于精细调整高层有源层中的分层形态

在此，首先开发了新型的小分子供体FSM6，它是BTR的同源分子，具有相似的分子结构，具有可比的光吸收性和不同的结晶度。基于BTR和FSM6合金供体的高效富勒烯型三元小分子太阳能电池（SMSC）在250 nm厚膜中显示出改善的三元活性层的分层相分离形态和分子结构顺序以及关键的结晶度供体成分BTR。此外，FSM6作为关键的第三组分在三元SMSC中也起电荷转移促进剂的作用。结果，基于BTR：FSM6：PC ₇₁的最佳三元SMSCBM的功率转换效率（PCE）高达10.21％，协同开路电压为0.950 V，短路电流密度为13.85 mA cm ^-2，填充系数为77.6％。 BTR：PC ₇₁ BM（PCE = 9.37％）或FSM6：PC ₇₁ BM（PCE = 8.00％）的二进制SMSC 。这项工作提供了一种有前途的方法，可以通过结合具有相似吸收光谱但结晶度不同的两个同源小分子作为合金供体来优化高性能三元SMSC的器件形态。

更新日期：2020-01-22

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