Optimizing sequence structures by stepwise-feeding terpolymerization for high-performance organic solar cells

Abstract

Terpolymerization is a feasible approach to optimize the device performance of organic semiconductors. Yet, since most reported terpolymers utilize a one-pot polymerization method, the regularity of the polymer backbone is...

A newly designed benzodithiophene building block: tuning of the torsional barrier for non-halogenated and non-aromatic solvent-processible photovoltaic polymers

“…To date, most studies on photovoltaic materials have mainly focused on the structural modication and optimization of nonfullerene acceptors, [5][6][7][8][9] while counterpart donor materials have been relatively overlooked. [10][11][12] The benzodithiophene (BDT) moiety is considered the most attractive building block for donor materials, and various BDTbased photovoltaic polymers have been successfully developed. [13][14][15][16][17] In 2012, Hou's group rst reported the PBDB-T polymer, demonstrating a PCE of 6.67% with PC 61 BM as an acceptor.…”

“…To date, most studies on photovoltaic materials have mainly focused on the structural modification and optimization of nonfullerene acceptors, 5–9 while counterpart donor materials have been relatively overlooked. 10–12…”

Terpolymerization and Regioisomerization Strategy to Construct Efficient Terpolymer Donors Enabling High‐Performance Organic Solar Cells

“…Although numerous efficient terpolymer donors have been developed, the ternary structure is complex and it is difficult to precisely control the molecular arrangement, resulting in poor batch reproducibility. [7] Additionally, the terpolymers achieved by random copolymerization will inevitably exhibit an irregular polymeric backbone with a random sequence distribution, which is detrimental to molecular stacking and charge transport. [5c,8] Therefore, it is imperative to design and select an appropriate third component to construct efficient terpolymers, and several principles should be followed.…”

Achieving efficient and stabilized organic solar cells by precisely controlling the proportion of copolymerized units in electron-rich polymers

“…As an effective and reliable method to address these issues, the random copolymerization strategy has been widely used to modify high performance polymer donor materials, and achieve high PCEs of over 17%. [21][22][23][24] By controlling the properties and the proportion of the third unit, optoelectronic properties such as the energy level, absorption spectrum, aggregation, and crystallization of the target random polymer can be effectively tuned. [25][26][27] In general, after determining the polymer matrix to be modified, the performance parameters of the OSCs based on it will be analyzed first to determine the direction of key modification.…”