High Miscibility Compatible with Ordered Molecular Packing Enables an Excellent Efficiency of 16.2% in All‐Small‐Molecule Organic Solar Cells

Abstract

to potentially obtain champion PCE with thermally stable morphology in ASM-OSCs.

The effects of the side-chain length of non-fullerene acceptors on their performance in all-small-molecule organic solar cells

“…65 The χ values of BSFTR:FC n -2Cl (from n = 4 to 6, 8, 10 and 12) blend films are 2.63, 1.12, 0.99, 0.59 and 0.52, respectively, indicating that the blend of BSFTR:FC12-2Cl exhibits the best miscibility, the most orderly and closely packed. 30 Highly ordered packing makes the BSFTR:FC12-2Cl-based ASM-OSCs exhibit high FF. However, overly good miscibility may cause reduced domain purity, 59,66,67 which have a strong impact on exciton separation, charge extraction, transport, recombination and collection, thus decreasing its J SC .…”

“…They also developed a novel SMD MPh-S based on the backbone of ZR1 and obtained an excellent PCE of 16.2% in MPh-S:BTP-eC9-based ASM-OSCs. 30 Moreover, the state-of-the-art single-junction ASM-OSCs have also exceeded 16% by using a ternary strategy. 31,32 However, it is believed that the best PCE of ASM-OSCs is far from that achieved in view of the best PCE of over 19% already afforded by that of PSCs.…”

“…Similar acceptor–donor–acceptor (A–D–A) structures and molecular sizes of active layer materials usually result in a very challenging control of bulk heterojunction morphologies in ASM-OSCs, which should be the most crucial issue needed to be addressed in future. 30,33,34…”

High‐Performance All‐Small‐Molecule Organic Solar Cells Enabled by Regio‐Isomerization of Noncovalently Conformational Locks

“…[11][12][13][14] With the development of small-molecule donors (SMDs), the binary and ternary ASM-OSCs have achieved PCEs of over 13% and 15%, respectively. [15][16][17][18][19][20][21][22] However, the efficiencies of ASM-OSCs still lag far behind those of polymer solar cells. Therefore, how to rationally design SMDs is a crucial factor for realizing highperformance ASM-OSCs.…”

Facile synthesis of annulated benzothiadiazole derivatives and their application as medium band gap acceptors in organic photovoltaic devices

“…1,2 In most of these applications the molecular energetics and band gap are one crucial element influencing their performance, together with control of their solid-state packing. 3 As such, the development of novel conjugated building blocks is important to allow the fine-tuning of material properties. This is especially the case for highly electron deficient units, in which the library of widely utilised building blocks tends to be much smaller than that of the electron rich analogues.…”