Advanced Energy Materials, 2018, 8(10), 1702489.
Abstract: In this work, a new benzo[1,2-b:4,5-b′]dithiophene (BDT) building block containing alkylthio naphthyl as a side chain is designed and synthesized, and the resulting polymer, namely PBDTNS-BDD, shows a lower HOMO energy level than that of its alkoxyl naphthyl counterpart PBDTNO‐BDD. An optimized photovoltaic device using PBDTNS-BDD as a donor exhibits power conversion efficiencies (PCE) of 8.70% and 9.28% with the fullerene derivative PC71BM and the fullerene-free small molecule ITIC as acceptors, respectively. Surprisingly, ternary blend devices based on PBDTNS-BDD and two acceptors, namely PC71BM and ITIC, shows a PCE of 11.21%, which is much higher than that of PBDTNO-BDD based ternary devices (7.85%) even under optimized conditions.
Journal of Materials Chemistry A, 2018, 6(47), 24267-24276.
Graphical abstract: A novel strategy is proposed to construct simple-structured SMAs using a weakly electron-deficient thiazolothiazole (TTz) core. The highest PCE of 8.77% is recorded for TTz1-based OSCs, which is the highest efficiency to date among non-fullerene OSCs with simple-structured SMAs.
Journal of Materials Chemistry A, 2018, 6, 12493-12505.
Abstract: In this paper, a series of narrow-band gap, π-conjugated small molecules (SMs) with a D(A–Ar)2linear framework, denoted as FBT(PyDPP-T)2, FBT(IID-T)2 and FBT(TDPP-T)2, have been designed and synthesized for application as donor materials in solution-processed SM organic solar cells (OSCs). The as-cast devices based on FBT(PyDPP-T)2, FBT(IID-T)2 and FBT(TDPP-T)2 exhibit PCEs of 5.04%, 5.68% and 6.86%, respectively. Encouragingly, after a SVA treatment with carbon disulfide (CS2) for 20 s, an impressively improved power conversion efficiency (PCE) from 6.86% to 9.00% with an increase of 35% was obtained in the FBT(TDPP-T)2/PC71BM (w/w, 1 : 1) based cells due to an enhanced short circuit current density (Jsc) of 16.14 mA cm−2 and fill factor (FF) of 73.52%, which is among the highest reported for D(A–Ar)2-type SM-based solar cells with a PCE up to 9.0% so far. Our research results reported here clearly demonstrate that highly efficient SM-OSCs can be obtained via rational design of their molecular structure and optimization of the phase-separated morphology through an appropriate solvent-vapor annealing process.
Journal of Materials Chemistry A 2016, 4, 18792-18803.
Graphical abstract: A novel vertical carboxylate functionalized benzodithiophene V-BDTC unit was designed as an election-accepting block to build D-A type copolymers. Two wide band gap polymers of PV-BDTC1and PV-BDTC2 were prepared with V-BDTC unit. A high Voc of 1.03 V and a significant PCE of 7.49% were achieved based on this kind of polymers.
Journal of Materials Chemistry C 2016, 4, 6007-6015.
Graphical abstract: Two novel dinuclear platinum complexes containing aryl-isoquinoline and oxadiazole-thiol ligands are synthesized and characterized. The Pt-Pt bond is confirmed by the (piq)2Pt2(µ-PhOXT)2 single crystal. High-efficiency NIR electroluminescence peaked about 704 nm is observed for the (niq)2Pt2(µ-C8PhOXT)2 in the solution-processed PLEDs with a notable external quantum efficiency (EQE) of 8.86% and an irradiate of 986 µWcm-2at 9 wt% dopant concentration.
Journal of Materials Chemistry A 2015,3, 13568-13576
Graphical abstract: Better photovoltaic performance with the improvement of short-circuit current density, open-circuit voltage and fill factor simultaneously was achieved by tuning the moiety sequence of their arms in star-shaped molecules, leading to the maximum power conversion efficiency (PCE) up to 5.07%.
Polymer Chemistry, 2015, 6, 4290-4298
Graphical abstract: To investigate the influence of side chains of quinoxaline on the photovoltaic performances, a novel D–A-type polymer of PBDTDT(Qx-3)-T was synthesized and characterized, in which BDT-T, T and Qx-3 were used as the donor (D) unit, π-bridge and acceptor (A) unit, respectively.
Journal of Materials Chemistry C 2015, 3, 6240-6248
Graphical abstract: In this study, three novel D–A-type terpolymers of PBDTT–PPzBT–H, PBDTT–PPzBT–F and PBDTT–PPzBT–O were synthesized by copolymerizing electron-rich BDTT and two electron-deficient PPz and BT units.
dvanced Energy Material, 2014, 1400680
Graphical abstract: Two pairs of indacenodithiophene (IDT) and quinoxaline based copolymers with meta- or para-hexyl-phenyl side chains on the IDT unit are synthesized. The meta-substituted polymers offer better solubility, higher molecular weight for both fluorinated and non-fluorinated copolymers, and a superior photovoltaic performance with a power conversion efficiency of 7.8% was obtained. The side-chaindesign strategy disclosed here is an efficient way for high performance conjugated polymers for organic electronics.
Chemical Communication, 2013, 49, 9335-9337
Graphical abstract: Enhanced photovoltaic performance with a PCE value up to 6.32% was achieved by fluorine substitution in a D-A1-D-A2 copolymer.
Advanced Energy Materials, 2018, 8(10), 1702489.
Abstract: In this work, a new benzo[1,2-b:4,5-b′]dithiophene (BDT) building block containing alkylthio naphthyl as a side chain is designed and synthesized, and the resulting polymer, namely PBDTNS-BDD, shows a lower HOMO energy level than that of its alkoxyl naphthyl counterpart PBDTNO‐BDD. An optimized photovoltaic device using PBDTNS-BDD as a donor exhibits power conversion efficiencies (PCE) of 8.70% and 9.28% with the fullerene derivative PC71BM and the fullerene-free small molecule ITIC as acceptors, respectively. Surprisingly, ternary blend devices based on PBDTNS-BDD and two acceptors, namely PC71BM and ITIC, shows a PCE of 11.21%, which is much higher than that of PBDTNO-BDD based ternary devices (7.85%) even under optimized conditions.
Journal of Materials Chemistry A, 2018, 6(47), 24267-24276.
Graphical abstract: A novel strategy is proposed to construct simple-structured SMAs using a weakly electron-deficient thiazolothiazole (TTz) core. The highest PCE of 8.77% is recorded for TTz1-based OSCs, which is the highest efficiency to date among non-fullerene OSCs with simple-structured SMAs.
Journal of Materials Chemistry A, 2018, 6, 12493-12505.
Abstract: In this paper, a series of narrow-band gap, π-conjugated small molecules (SMs) with a D(A–Ar)2linear framework, denoted as FBT(PyDPP-T)2, FBT(IID-T)2 and FBT(TDPP-T)2, have been designed and synthesized for application as donor materials in solution-processed SM organic solar cells (OSCs). The as-cast devices based on FBT(PyDPP-T)2, FBT(IID-T)2 and FBT(TDPP-T)2 exhibit PCEs of 5.04%, 5.68% and 6.86%, respectively. Encouragingly, after a SVA treatment with carbon disulfide (CS2) for 20 s, an impressively improved power conversion efficiency (PCE) from 6.86% to 9.00% with an increase of 35% was obtained in the FBT(TDPP-T)2/PC71BM (w/w, 1 : 1) based cells due to an enhanced short circuit current density (Jsc) of 16.14 mA cm−2 and fill factor (FF) of 73.52%, which is among the highest reported for D(A–Ar)2-type SM-based solar cells with a PCE up to 9.0% so far. Our research results reported here clearly demonstrate that highly efficient SM-OSCs can be obtained via rational design of their molecular structure and optimization of the phase-separated morphology through an appropriate solvent-vapor annealing process.
Journal of Materials Chemistry A 2016, 4, 18792-18803.
Graphical abstract: A novel vertical carboxylate functionalized benzodithiophene V-BDTC unit was designed as an election-accepting block to build D-A type copolymers. Two wide band gap polymers of PV-BDTC1and PV-BDTC2 were prepared with V-BDTC unit. A high Voc of 1.03 V and a significant PCE of 7.49% were achieved based on this kind of polymers.
Journal of Materials Chemistry C 2016, 4, 6007-6015.
Graphical abstract: Two novel dinuclear platinum complexes containing aryl-isoquinoline and oxadiazole-thiol ligands are synthesized and characterized. The Pt-Pt bond is confirmed by the (piq)2Pt2(µ-PhOXT)2 single crystal. High-efficiency NIR electroluminescence peaked about 704 nm is observed for the (niq)2Pt2(µ-C8PhOXT)2 in the solution-processed PLEDs with a notable external quantum efficiency (EQE) of 8.86% and an irradiate of 986 µWcm-2at 9 wt% dopant concentration.
Journal of Materials Chemistry A 2015,3, 13568-13576
Graphical abstract: Better photovoltaic performance with the improvement of short-circuit current density, open-circuit voltage and fill factor simultaneously was achieved by tuning the moiety sequence of their arms in star-shaped molecules, leading to the maximum power conversion efficiency (PCE) up to 5.07%.
Polymer Chemistry, 2015, 6, 4290-4298
Graphical abstract: To investigate the influence of side chains of quinoxaline on the photovoltaic performances, a novel D–A-type polymer of PBDTDT(Qx-3)-T was synthesized and characterized, in which BDT-T, T and Qx-3 were used as the donor (D) unit, π-bridge and acceptor (A) unit, respectively.
Journal of Materials Chemistry C 2015, 3, 6240-6248
Graphical abstract: In this study, three novel D–A-type terpolymers of PBDTT–PPzBT–H, PBDTT–PPzBT–F and PBDTT–PPzBT–O were synthesized by copolymerizing electron-rich BDTT and two electron-deficient PPz and BT units.
dvanced Energy Material, 2014, 1400680
Graphical abstract: Two pairs of indacenodithiophene (IDT) and quinoxaline based copolymers with meta- or para-hexyl-phenyl side chains on the IDT unit are synthesized. The meta-substituted polymers offer better solubility, higher molecular weight for both fluorinated and non-fluorinated copolymers, and a superior photovoltaic performance with a power conversion efficiency of 7.8% was obtained. The side-chaindesign strategy disclosed here is an efficient way for high performance conjugated polymers for organic electronics.
Chemical Communication, 2013, 49, 9335-9337
Graphical abstract: Enhanced photovoltaic performance with a PCE value up to 6.32% was achieved by fluorine substitution in a D-A1-D-A2 copolymer.