A structurally simple linear conjugated polymer toward practical application of organic solar cells

Abstract

The commercialization of organic solar cells (OSCs) requires the realization of highly efficient devices from low-cost polymer donors with excellent batch-to-batch reproducibility and universality matching with different electron acceptors. Herein,...

24.96%‐Efficiency FACsPbI3 Perovskite Solar Cells Enabled by an Asymmetric 1,3‐Thiazole‐2,4‐Diammonium

“…[1,5,6] However, the mismatch of ionic size between formamidine (FA + ) and lead iodine octahedron [PbI 6 ] 4− makes FAPbI 3 film easily undergo a spontaneous phase transition from α-black phase to δ-yellow Thiazole unit, which shows excellent electron transport ability due to its electron-withdrawing nitrogen of imine (CN), has been wildly applied in constructing high-performance organic semiconductors for organic field-effect transistors (OFETs), [26] organic light-emitting diodes (OLEDs) [27,28] and organic/dyesensitized solar cells. [29][30][31][32] Employing thiazole derivatives to modify perovskite is less. Kanatzidis's group adopted thiazole additive to couple with vapor annealing for regulating the perovskite crystal growth and suppressing surface defects.…”

18.9% Efficiency Ternary Organic Solar Cells Enabled by Isomerization Engineering of Chlorine‐Substitution on Small Molecule Donors

“…Bulk-heterojunction (BHJ) organic solar cells (OSCs) has been recognized as one of most promising photovoltaic technology owing to the advantage of light weight, mechanical flexibility, low cost, and solution processing ability. [1][2][3][4][5][6] Benefiting from the composition of the active layer, ternary OSCs can be classified to either one donor/two acceptor (1D2A) or two donors/ one acceptor (2D1A). [24][25][26][27] Nowadays, ternary OSCs composing two acceptors are more widely studied because of their high miscibility of the two acceptors and easily tuned energy levels.…”

Enhanced Photovoltaic Performances via Chlorine Substitution on Alkylphenyl Side Chains of a Conjugated Polymer

“…7−14 Among them, the innovative design and application of D−A type polymer donor materials are the crucial aspects to promote the development of the OSC field. 15,16 In this type of donor, the effect of the push−pull electron could be easily formed, and the energy level and the range of absorbance could be regulated by varying the structure of the electron-donating (D) and electron-withdrawing (A) units. 17 Benzo[1,2-b:4,5-b′]dithiophene (BDT), which has a large planar structure and excellent crystallinity, is commonly used as a D unit to widen the degree of conjugation and improve molecular packing ability.…”

“…Among them, the innovative design and application of D–A type polymer donor materials are the crucial aspects to promote the development of the OSC field. , In this type of donor, the effect of the push–pull electron could be easily formed, and the energy level and the range of absorbance could be regulated by varying the structure of the electron-donating (D) and electron-withdrawing (A) units . Benzo­[1,2- b :4,5- b ′]­dithiophene (BDT), which has a large planar structure and excellent crystallinity, is commonly used as a D unit to widen the degree of conjugation and improve molecular packing ability. , Furthermore, the two-dimensional (2D) strategy is considered as an efficient method to improve the morphology and adjust the energy level by incorporating phenyl or thiophene to the conjugated side chains. , In particular, introducing halogen atoms into such side chains is proved to have multiple virtues such as optimized morphology, enhanced charge transfer, and improved open circuit voltage ( V OC ). − …”