18.42% efficiency polymer solar cells enabled by terpolymer donors with optimal miscibility and energy levels

Abstract

The rapid development of non-fullerene acceptors (NFAs) has placed increasing demands on polymer donors and current-available top-performing polymer donors still have space to optimize to work perfectly with the state-of-the-art...

Random copolymerization strategy for non-halogenated solvent-processed all-polymer solar cells with a high efficiency of over 17%

“…From the film to the solution state, there is almost no difference in the 0-0 transition peak position for JD40 (from 586 nm to 585 nm), but a slight blueshift can be observed for JD40-BDD20 (from 586 nm to 580 nm), implying that the stronger pre-aggregation of JD40 in the solution state can be weakened by the introduction of the BDD unit. 39,45,46 To further analyze the pre-aggregation behavior of the P D s in solution, their variable-temperature UV-vis absorption spectra (from 25 to 100 1C) were measured in dilute o-XY. As displayed in Fig.…”

Highly Flexible All‐Polymer Solar Cells Processed without Post‐Treatment Achieving 13.56% Efficiency

“…Such a strong temperature-dependent aggregation property of the polymer donors and weak aggregation property of the polymer acceptors give a good chance for constructing efficient organic photovoltaic devices. [32][33][34][35] The energy levels of each polymer are measured with electrochemical cyclic voltammetry (CV). As shown in Figure 1d and S4, Supporting Information, the highest occupied molecular orbital (HOMO)/the lowest unoccupied molecular orbital (LUMO) are measured to be À5.59/À3.68 eV for D18 and À5.65/À3.85 eV for PYSe-2FT.…”

New Wide Bandgap Conjugated D‐A Copolymers Based on BDT or NDT Donor Unit and Anthra[1,2‐b:4,3,bʹ:6,7‐cʺ]trithiophene‐8‐12‐dione Acceptor for Fullerene‐Free Polymer Solar Cells

“…[1][2][3][4][5][6] With the development of the acceptors which are based on nonfullerene small molecule acceptors (NFSMAs), particularly A-DA'D-A denoted as Y6 and its derivatives, [7][8][9] developing the wide variety of bulk heterojunction active layers [10][11][12] and interface engineering, [13,14] PSCs with a single junction BHJ layer achieved a power conversion efficiency (PCE) of more than 18%. [15][16][17][18][19][20] The efficient PSCs employ the bulk heterojunction (BHJ) thin film which is made of polymer or small molecule as a donor (p-type semiconductor) and a fullerene derivative [21,22] or a NFSM as an acceptor (n-type semiconductor). [23][24][25][26][27][28][29][30] In most cases, the efficient BHJ-PSCs use the narrow bandgap NFSMAs, Scheme 1.…”