2021
DOI: 10.1002/anie.202104766
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A Synergistic Strategy of Manipulating the Number of Selenophene Units and Dissymmetric Central Core of Small Molecular Acceptors Enables Polymer Solar Cells with 17.5 % Efficiency

Abstract: A dissymmetric backbone and selenophene substitution on the central core was used for the synthesis of symmetric or dissymmetric A‐DA′D‐A type non‐fullerene small molecular acceptors (NF‐SMAs) with different numbers of selenophene. From S‐YSS‐Cl to A‐WSSe‐Cl and to S‐WSeSe‐Cl, a gradually red‐shifted absorption and a gradually larger electron mobility and crystallinity in neat thin film was observed. A‐WSSe‐Cl and S‐WSeSe‐Cl exhibit stronger and tighter intermolecular π–π stacking interactions, extra S⋅⋅⋅N non… Show more

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Cited by 154 publications
(84 citation statements)
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“…[ 15,16 ] Solubility of small molecules is higher than polymers due to lower molecular weight. [ 17,18 ] Their solubility in variety of green solvents is a strong motivation to use small molecules. Low‐cost synthesis is another motivational aspect.…”
Section: Introductionmentioning
confidence: 99%
“…[ 15,16 ] Solubility of small molecules is higher than polymers due to lower molecular weight. [ 17,18 ] Their solubility in variety of green solvents is a strong motivation to use small molecules. Low‐cost synthesis is another motivational aspect.…”
Section: Introductionmentioning
confidence: 99%
“…[10][11][12] In recent years, the emergence of fused-ring non-fullerene acceptors (NFAs) has played a key role in the development of OSCs, especially those with the structures based on the laddertype electron-deficient fused ring as central core and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) as end groups, such as ITIC, [13] IT-4F, [14] Y6, [15] and its derivatives. [16,17] Meanwhile, the development of polymer donors is also crucial for achieving efficient OSCs. The polymer PM6, an alternating D-A (D: donor unit, A: acceptor unit) copolymer with wide bandgap, which is one of the most commonly used polymer donors, possesses a deep highest occupied molecular orbital (HOMO) energy level and strong crystallinity.…”
Section: Introductionmentioning
confidence: 99%
“…In recent years, the emergence of fused‐ring non‐fullerene acceptors (NFAs) has played a key role in the development of OSCs, especially those with the structures based on the ladder‐type electron‐deficient fused ring as central core and 2‐(3‐oxo‐2,3‐dihydroinden‐1‐ylidene)malononitrile (IC) as end groups, such as ITIC, [13] IT‐4F, [14] Y6, [15] and its derivatives [16,17] . Meanwhile, the development of polymer donors is also crucial for achieving efficient OSCs.…”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4][5][6][7][8][9][10] Including ITIC and Y6, most of high-performance SMAs possess an acceptor-donor-acceptor (AÀ D-A) type structural skeleton, where a ladder-type fused ring (like IDTT, TPBT) was used as the central donor (D) unit and an electron-withdrawing unit is employed as the end-capping acceptor (A) group. [21][22][23][24][25] Here, it should be noted that the ladder-type central unit is fused by an electron-deficient core (e. g. benzothiadiazole) with an electron-rich unit (typically dithienothiophen[3.2-b]pyrrole) in Y-series SMAs. To well tune the molecular structure, absorption spectrum, and electronic energy levels (HOMO/ LUMO) of these SMAs, various molecular design strategies are concentrated on the backbone manipulation of D unit, the substituent modification of A group, and the conjugated πbridge engineering between D and A units.…”
Section: Introductionmentioning
confidence: 99%