Manipulation of the Open-Circuit Voltage of Organic Solar Cells by Desymmetrization of the Structure of Acceptor-Donor-Acceptor Molecules

Abstract

The synthesis of acceptor-donor-acceptor (A-D

Effects of Heteroatom Substitutions on the Crystal Structure, Film Formation, and Optoelectronic Properties of Diketopyrrolopyrrole‐Based Materials

“…[1][2][3][4][5] These conjugated molecules have a molecular architecture containing a conjugated backbone to achieve desired optoelectronic properties and alkyl side chains to enable solution processability. To effi ciently absorb solar irradiation, the conjugated backbone usually incorporates chromophoric moieties such as benzoporphyrin, [ 6 ] diketeropyrrolopyrrole (DPP), [7][8][9][10][11] isoindigo, [ 12 , 13 ] squaraine, [14][15][16][17][18] oligothiophene, [19][20][21][22][23] borondipyrromethene, [ 24 , 25 ] and merocyanine. [26][27][28] The conjugation of the backbone is typically extended over several aryl moieties and ended by groups such as vinyl, thienyl, and phenyl derivatives.…”

N-Alkyl functionalized barbituric and thiobarbituric acid bithiophene derivatives for vacuum deposited n-channel OFETs

“…Another similar 1,3-dicarbonyl acceptor, barbituric acid, has been developed primarily as a small molecule donor-acceptor (D-A) and acceptor-donor-acceptor (A-D-A) p-type materials for use with fullerenes in OPVs 14,15 and dyes for p-type dye sensitized solar cells. 16 To the best of our knowledge, the only reports of barbituric acid functionalized semiconductor materials for OFETs have shown hole mobilities ranging from 10 À7 to…”

Synthesis and photovoltaic properties of new small molecules with rhodanine derivative as the end-capped blocks

“…Currently, BHJ OSCs are based on two types of donor materials, conjugated polymers and small molecules [15,16]. Compared to their conjugated polymer counterparts, small molecules offer potential advantages in terms of defined molecular structure, uniform molecular weight, easy purification, and no batch to batch variations [17][18][19][20][21]. Thus, solution-processed small molecules BHJ OSCs have stimulated more and more attention, and the PCE of the devices based on small molecules as the donors and fullerene derivatives as the acceptors has been up to 8% [22].…”