Showing papers by "Weichao Chen published in 2017"
TL;DR: In this paper, the authors used two donor polymers (PBDTTPD and PBDTTT-C-T) with similar polymer backbones and complementary absorption and PC71BM as the acceptor to achieve high power conversion efficiency (PCE) of 93% with a high short-circuit current density (J(sc)) of 172 mA cm(-2).
Abstract: High-efficiency ternary polymer solar cells (PSCs) are fabricated by using two donor polymers (PBDTTPD and PBDTTT-C-T) with similar polymer backbones and complementary absorption and PC71BM as the acceptor A high power conversion efficiency (PCE) of 93% is achieved with a high short-circuit current density (J(sc)) of 172 mA cm(-2) The enhanced J(sc) and PCEs are mainly attributed to the broadened photoresponse of the ternary blend Good miscibility of the two donor polymers is found due to the similar polymer main chains, leading to the desired morphology between the donors and PC71BM in the ternary blends The trend of open-circuit voltage (V-oc) variations indicates the formation of a polymer alloy in this ternary blend Our work demonstrates that using two donor polymers with similar backbone structures is a rational strategy for realizing high-performance ternary PSCs
34 citations
TL;DR: The micro-structure ordering of the π-conjugated polymer film self-assembling from solution governs its electrical characteristics and performances for organic electronics as discussed by the authors, which shows how to design novel substituents to optimize the polymer arrangement and packing in its solid state.
25 citations
TL;DR: A new way was meticulously designed to utilize the localized surface plasmon resonance (LSPR) effect and the light scattering effect of silver nanoplate and core-shell Ag@SiO2 nanoparticles to enhance the photovoltaic performances of polymer solar cells (PSCs).
Abstract: A new way was meticulously designed to utilize the localized surface plasmon resonance (LSPR) effect and the light scattering effect of silver nanoplate (Ag-nPl) and core–shell Ag@SiO2 nanoparticles (Ag@SiO2-NPs) to enhance the photovoltaic performances of polymer solar cells (PSCs). To prevent direct contact between silver nanoparticles (Ag-NPs) and photoactive materials which will cause electrons quenching, bare Ag-nPl were spin-coated on indium tin oxide and silica capsulated Ag-NPs were incorporated to a PBDTTT-C-T:PC71BM active layer. As a result, the devices incorporated with Ag-nPl and Ag@SiO2-NPs showed great enhancements. With the dual effects of Ag-nPl and Ag@SiO2-NPs in devices, all wavelength sensitization in the visible range was realized; therefore, the power conversion efficiency (PCE) of PSCs showed a great enhancement of 14.0% to 8.46%, with an increased short-circuit current density of 17.23 mA·cm–2. The improved photovoltaic performances of the devices were ascribed to the LSPR effect a...
22 citations
TL;DR: Bithienopyrroledione (bi-TPD) based polymers P1 and P2 are designed and synthesized and photovoltaic devices based on these polymers show power conversion efficiencies (PCEs) higher than expected.
11 citations
TL;DR: In this article, the efficiency of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) based organic solar cells was enhanced by using 1,2,4-trichlorobenzene (TCB) as a processing additive to control the blend morphology.
Abstract: The efficiency of the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) based organic solar cells was enhanced by using 1,2,4-trichlorobenzene (TCB) as a processing additive to control the blend morphology. The addition of TCB improved the arrangement of P3HT which resulted in good phase separated blend films. Correspondingly, the optimized solar cells showed a power conversion efficiency (PCE) of 4.17% with a fill factor (FF) of 0.69, which were higher than those of common thermal annealing devices (PCE 3.84%, FF 0.67). The efficiency was further improved to 4.74% by thermal annealing at 150 °C for 10 min with a higher FF of 0.74.
5 citations
Patent•
04 Jan 2017
TL;DR: In this article, a donor-receptor type narrow-band semiconductor polymer containing annular alkyl chains was proposed to regulate and control the self-assembly character of the polymer and improving the ordering performance of the polymeric polymer in a mixed film.
Abstract: The invention relates to a donor-receptor type narrow-band semiconductor polymer containing annular alkyl chains The polymer comprises different donor and receptor structural units The polymer aims at utilizing the advantages of high rigidity, good symmetry and preferential conformation of cycloparaffin relative to branched paraffin for regulating and controlling the self-assembly character of the film forming process of the polymer and improving the ordering performance of the polymer in a mixed film The annular alkyl chains can properly twist polymer main chains, even so, the band gap of the polymer is almost not influenced, wide absorption is still achieved, and the polymer is crucially important to improving the open-circuit voltage of the polymer solar cell and reducing energy loss Based on researches, it is found that the annular alkyl chains can comprehensively improve the open-circuit voltage, short-circuit current density and fill factor of the polymer solar cell, finally, the power conversion efficiency of the polymer solar cell is remarkably improved, and the polymer is a semiconductor polymer modified and substituted group with wide prospects
1 citations