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
Artikel i vetenskaplig tidskrift, 2020

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.

morphology optimization

ternary small molecule solar cells

thick films

alloy donors


Qunping Fan

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Tao Liu

Hong Kong University of Science and Technology

Ming Zhang

Shanghai Jiao Tong University

Wenyan Su

Chalmers, Kemi och kemiteknik

Jinan University

Ulises Mendez Romero

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Tao Yang

Chinese Academy of Sciences

Xinjian Geng

Chalmers, Kemi och kemiteknik

Lintao Hou

Jinan University

Donghong Yu

Aalborg Universitet

Sino-Danish Center for Education and Research Denmark

Feng Liu

Shanghai Jiao Tong University

Beijing Natl Lab Mol Sci

He Yan

Hong Kong University of Science and Technology

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Zhengzhou University

Small Methods

23669608 (eISSN)

Vol. 4 3 1900766



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