Secondary Bonds Modifying Conjugate‐Blocked Linkages of Biomass‐Derived Lignin to Form Electron Transfer 3D Networks for Efficiency Exceeding 16% Nonfullerene Organic Solar Cells

Abstract

In article number 2001494, Lihui Chen, Xinhua Ouyang, and co‐workers successfully demonstrate secondary bonds to modify conjugate‐blocked linkages of biomass‐derived lignin or the electron transfer layer of organic solar cells. The enhanced conductivity, resisted phase separation, and repaired the contact makes it valuable for organic electronics.

Acid-Assisted Noncovalent Interaction with Enhanced Electron Transportation on Active/Interfacial Layers for 16.43% Nonfullerene Organic Solar Cells

“…This indicates that the excessive acid will break the phase structures of PBDB-T-2F:BTP-4F and result in poor efficiency, which has been demonstrated in our previous publication. 29 As AA decreased to 4 mg/mL, one of the highest PCEs is obtained with the value of 16.43%, and the corresponding J SC is 26.51 mA/cm 2 , V OC is 0.86 V, and FF is 72.07%. Then, to further reduce acid concentration, the distinct drop of V OC and FF is observed.…”

“…28 Recently, we have proposed the secondary bond interaction on the acceptors and the interlayer with improved electron transport and efficiency. 29 However, to the best of our knowledge, studies on noncovalent interaction for the enhanced electron transport of OSCs are still rarely reported, especially for research on NFA-OSCs. In this work, the noncovalent interaction between the NFAs and the electron transport layer is successfully demonstrated based on the interlayer materials of amino terminal substituted perylene diimide (PDIN) with the assistance of acetic acid (AA).…”

“…For example, Huang et al reported the interaction from the n-doping with acceptors, which formed effective charge transport between the acceptors and the interlayer, and a significantly enhanced performance of fullerene- and NFA-OSCs was observed . Recently, we have proposed the secondary bond interaction on the acceptors and the interlayer with improved electron transport and efficiency . However, to the best of our knowledge, studies on noncovalent interaction for the enhanced electron transport of OSCs are still rarely reported, especially for research on NFA-OSCs.…”

Effect of Multidonor and Insertion Position of a Chromophore on the Photovoltaic Properties of Phenoxazine Dyes

“…Since the invention of the first polythiophene field-effect transistor in 1986, 1 development of new organic semiconductor materials and research on devices and manufacturing processes have never been terminated. Nowadays, because of the wide-ranging sources, easily controllable structure, low cost, flexibility, and ease of manufacture, many devices such as organic thin-film transistors, 1 organic electroluminescent devices, 2 organic solar cells, 3 , 4 organic sensors, 5 and organic memory 6 based on organic semiconductor materials have made amazing progress. Since first reported by O’Regan and Gräzel in 1991, 7 dye-sensitized solar cells (DSCs), as one of the photo-to-electric conversion devices based on organic semiconductor materials, have attracted considerable and sustained attention because of their ease of fabrication, high efficiency, and cost-effectiveness.…”

Built‐In Potential and Operational Stability of Nonfullerene Organic Solar Cells

“…OSCs made with low-bandgap polymers [1][2][3] and nonfullerene acceptors have many advantages, improved miscibility between the acceptor and donor in the photoactive blend layers, higher absorption extending to the long wavelength range in the solar spectrum, and tunable optical and electronic properties. Many exciting advancements have been developed for attaining high power conversion efficiency (PCE) OSCs through the emergence of new polymer donors with tailored energy levels, [4][5][6] nonfullerene acceptors, [7,8] materials processing, [9][10][11] and new device fabrication technologies. [3,12] A PCE of >17% has been achieved for solution-processable OSCs.…”