Oligothiophene electron donor and electron acceptor for all small molecule organic solar cells with efficiency over 9%

Selenophene-containing benzodithiophene based donors with different alkyl chains in terminal groups for high-performance all-small-molecule organic solar cells

“…Among the varieties of SM donors reported previously, acceptor-donor-acceptor (A-D-A) type molecules, such as oligothiophene or benzodithiophene (BDT) based donors, have shown great success in ASM-OSCs. [39][40][41][42][43][44] In particular, the BDT unit has been widely used as the central building block in the development of various SM donors, owing to its excellent charge transfer properties and easy modification. For example, BTR, a well-known SM donor with thiophenesubstituted BDT as the central unit, as developed by Jones et al, 45 shows high PCEs exceeding 11% for BTR:Y6 based devices.…”

Sensitizers of Metal Complexes with Sulfur Coordination Achieving a Power Conversion Efficiency of 12.89%

“…Electron donors, π-bridge, electron acceptors, and anchoring groups are essential components of D−π–A dye sensitizers. The insertion of an auxiliary electron acceptor in between the electron donor and π-bridge can modulate the highest occupied molecular orbital (HOMO) and HUMO energy levels and energy gap ( E g ) of the dye molecule, reduce the electron recombination, and improve absorption spectra and photovoltaic performance of the dye sensitizer. − Generally, quinoxaline (Qu), , phthalimide, benzotriazole (BTZ), , diketopyrrole (DPP), and benzothiadiazoles (BTD) , have been used as auxiliary electron acceptors. Organic dye sensitizers have many advantages, such as higher V oc , the availability of higher performance dyes in a wide range of colors, etc., but there are also some disadvantages, such as poor thermal stability, low molar extinction coefficients, and poor PCE enhancement. , However, adopting metal complexes to replace the above organic compounds as auxiliary electron acceptors can improve the thermal stability of dyes sensitizer, improve the molar extinction coefficient, enhance intramolecular charge transfer (ICT) ability, and strengthen their electron-withdrawing ability. , The electron-withdrawing ability of the auxiliary electron acceptor can be regulated by the strength of the coordination bond between the central metal and the ligand .…”

Ternary organic solar cells with a selenophene-containing donor guest achieve a high efficiency of 18.41%

“…[13][14][15][16][17][18][19][20][21][22] Combining the unique advantages of light weight, large-area fabrication, and flexibility, BHJ-OSCs show great commercialization prospects. [23][24][25][26][27][28][29] To date, the traditional binary BHJ-OSCs consisting of a polymer donor and a nonfullerene acceptor (NFA) in the active layer have demonstrated great success; however, the shortcomings, such as inferior light capturing, higher energy loss (E loss ), lower open-circuit voltage (V oc ), and fill factor (FF), should not be neglected. [30][31][32][33] Therefore, great efforts have been devoted in finding that introducing a third component into a binary host system is an effective strategy to resolve the critical problems mentioned above.…”

“…13–22 Combining the unique advantages of light weight, large-area fabrication, and flexibility, BHJ-OSCs show great commercialization prospects. 23–29…”