Design and synthesis of low band gap non-fullerene acceptors for organic solar cells with impressively high Jsc over 21 mA cm_2

Abstract

Three low bandgap non-fullerene acceptors based on thieno[3,2-b]thiophene fused core with different ending groups, named TTIC-M, TTIC, TTIC-F were designed and synthesized. Using a wide bandgap polymer PBDB-T as donor to form a complementary absorption in the range of 300-900 nm, high efficencies of 9.97%, 10.87% and 9.51% were achieved for TTIC-M, TTIC and TTFC-F based photovoltaic devices with impressively high short circuit current over 21 mA cm −2 .

A Review of Grazing Incidence Small‐ and Wide‐Angle X‐Ray Scattering Techniques for Exploring the Film Morphology of Organic Solar Cells

“…It is thought that volatile solvents are very good to achieve optimal domain size and phase separation, as well as other crystallinity features, as a result, lead to improved charge transport. [ 74 ] Ma and coworkers used solvent annealing during and after casting to improve the performance of PTB7‐Th:ITIC. [ 75 ] GIWAXS pattern showed increase in intensity for ITIC OOP lamellar and π–π stacking diffraction ( Figure ).…”

“…In few other studies, increase in backbone conjugation length has increased the electron mobility. GIWAXS analysis indicated increase in crystallinity (stronger lamellar and π–π stacking scattering) [74c,133] …”

A Halogenation Strategy for over 12% Efficiency Nonfullerene Organic Solar Cells

“…NFA design is still the major driving force to pursue high performance of OSCs. In the past decade, especially in recent three years, many great small molecule‐based NFAs with different chemical structures, such as with acceptor–donor–acceptor (A–D–A) backbone architectures and naphthalene diimide (NDI), perylene diimide (PDI), diketopyrrolopyrrole (DPP) based NFAs, etc., have been designed and evaluated. To date, NFAs with A–D–A structure have earned great success and PCEs over 13% have been achieved .…”

Rhodanine-based nonfullerene acceptors for organic solar cells

“…While in terms of electron-withdrawing "A" moieties, dye molecules have been often used (Fig. 1c) including 2,3-dihydro-1H-indene-1,3-dione (ID) [23,24], INCN [15,[25][26][27][28][29], thiobarbituric acid (TBA) [30,31], rhodanine (RD) [9,32], 2-(1,1-dicyanomethylene)rhodanine (RCN) [33,34], etc. Among these dyes, INCN derivatives are the most popular "A" moieties toward high performance NFAs through rational structural modifications.…”