Synthesis of D‐A copolymers based on thiadiazole and thiazolothiazole acceptor units and their applications in ternary polymer solar cells

Abstract

We have designed and synthesized two wide bandgap new donor-acceptor (D-A) copolymers consisting of the same alkylthiazole-substituted benzo [1,2-b;4,5-b 0 ]dithiophene (BDTTz) donor unit and but different acceptor units, i.e., thiazolo [5,4-d]thiazole (TT Z ) (P122) and 1,3,-4 thiadiazole (TDz) (P123) and investigated their optical and electrochemical properties. We have

Interpretable Machine Learning Model for the Highly Accurate Prediction of Efficiency of Ternary Organic Solar Cells Based on Nonfullerene Acceptor using Effective Molecular Descriptors

“…The SHAP waterfall plots of Figure 7 are used to visualize local explanations of individual data points of the testing set. The operations of PM7:Y6:NC 70 BA OSC and P122:Y6:PC 71 BM OSC are revisited in previous studies [33,34] and plot the SHAP explanations for each device in Figure 7a,b, respectively. The vertical location of a descriptor name is used to represent its relative importance to other descriptors.…”

“…The experimental descriptors χ1 and χ2 are directly correlated with the PCE of nonfullerene acceptorbased ternary OSCs in each case. The chemical structure of the testing material (e.g., PM7, Y6, NC 70 BA, and P122) [33,34] is displayed in Scheme 1. The machine learning model suggests that the electronegativity of dominating donor should be rationally designed to construct high-performance nonfullerene acceptor-based ternary OSCs.…”

Recent Advances in Organic Photovoltaic Materials Based on Thiazole‐Containing Heterocycles

“…Thereafter, Keshtov et al designed and synthesized a series of WBG D‐A copolymer donors, P125, P132, P122, and P123, based on BDTTz donor unit with different A units, including 8H‐pyrrolo[3,4‐b]dithieno[3,2‐f:2’,3’‐h]quinoxaline‐8,10(9H)‐dione (PDTQxD), thieno[3,4‐c]pyrrole‐4‐6‐dione (TPD), thiazolo[5,4‐d]thiazole, and 1,3,‐4 thiadiazole, respectively. [ 60 ] When these donors were blended with the corresponding acceptor, promising photovoltaic results were achieved. For example, the PCE of a device based on P122 was higher than that of a device based on PB[N] with T as a conjugated side chain.…”

Side chain engineering of fluorinated benzothiadiazole‐based polymers: Improving the charge transport in organic field‐effect transistors

“…Because of conjugated electrons and polymer structure, conjugated polymers have good semiconductor properties, such as solution processability, mechanical properties and thermal stability. [1][2][3][4][5][6] In recent years, conjugated polymers have been widely used in producing light, large-area and flexible electronic devices, such as OFETs and organic solar cells (OSCs). [7][8][9][10][11][12] Among conjugated polymers, the polymers composed of electron donors and electron acceptors alternately are called donor-acceptor (D-A) polymers.…”

“…Because of conjugated electrons and polymer structure, conjugated polymers have good semiconductor properties, such as solution processability, mechanical properties and thermal stability 1–6 . In recent years, conjugated polymers have been widely used in producing light, large‐area and flexible electronic devices, such as OFETs and organic solar cells (OSCs) 7–12 .…”