Showing papers by "Anyi Mei published in 2016"

Enhanced electronic properties in CH3NH3PbI3via LiCl mixing for hole-conductor-free printable perovskite solar cells

Abstract: By mixing perovskite MAPbI3 (MA = CH3NH3+) with LiCl, an effective one-step drop-coating approach was developed to improve the performance of hole-conductor-free printable perovskite solar cells. The LiCl-mixed perovskite exhibited superior electronic properties because of the improved conductivity of the perovskite layer enabling faster electron transport. LiCl-mixing also improved the crystallinity and morphology of the perovskite layer. As a consequence, perovskite solar cells prepared using the LiCl-mixed perovskite as the light harvester produced higher performances compared with the unmixed perovskite, improving the power conversion efficiency from 10.0% to 14.5%.

Efficient Compact-Layer-Free, Hole-Conductor-Free, Fully Printable Mesoscopic Perovskite Solar Cell

Abstract: A compact-layer-free, hole-conductor-free, fully printable mesoscopic perovskite solar cell presents a power conversion efficiency of over 13%, which is comparable to that of the device with a TiO2 compact layer. The different wettability of the perovskite precursor solution on the surface of FTO and TiO2 possesses a significant effect on realizing efficient mesoscopic perovskite solar cell. This result shows a promising future in printable solar cells by further simplifying the fabrication process and lowering the preparation costs.

The introduction of conjugated isolation groups into the common acceptor cyanoacrylic acid: an efficient strategy to suppress the charge recombination in dye sensitized solar cells and the dramatically improved efficiency from 5.89% to 9.44%

Abstract: The traditional acceptor, cyanoacrylic acid, was modified by the insertion of different aromatic rings as the isolation groups between the CN and COOH moieties, with the aim to suppress the possible charge recombination in dye sensitized solar cells. The results indicated that the larger isolation group was beneficial to inhibit the interfacial recombination, and the highest Voc was obtained by dye LI-78 with biphenyl as the isolation group. Combined with electron injection, the highest conversion efficiency (η) of 9.44% was achieved by dye LI-76 featuring a phenyl unit as the isolation group, whereas that of the reference sensitizer LI-75 without isolation group was only 5.89% under the same test conditions, providing a simple and convenient method to optimize the photovoltaic performance of organic dyes.

Conjugated or Broken: The Introduction of Isolation Spacer ahead of the Anchoring Moiety and the Improved Device Performance

Abstract: Acceptors in traditional dyes are generally designed closed to TiO2 substrate to form a strong electronic coupling with each other (e.g., cyanoacrylic acid) to enhance the electron injection for the high performance of the corresponding solar cells. However, some newly developed dyes with chromophores or main acceptors isolated from anchoring groups also exhibit comparable or even higher performances. To investigate the relatively untouched electronic coupling effect in dye-sensitized solar cells, a relatively precise method is proposed in which the strength is adjusted gradually by changing isolation spacers between main acceptors and anchoring groups to partially control the electronic interaction. After an analysis of 3 different groups of 11 sensitizers, it is inferred that the electronic coupling should be kept at a suitable level to balance the electron injection and recombination. Based on a reference dye LI-81 possessing a cyanoacrylic acid as acceptor and anchoring group, both photocurrent and ph...

Composite solar cell and preparation method thereof

Abstract: The invention discloses a novel solar cell The solar cell comprises a mesoscopic perovskite solar cell, thermoelectric cells and a radiator, which are stacked in sequence, wherein the mesoscopic perovskite solar cell and the thermoelectric cells are integrated by bonding or respectively depositing different P type and N type thermoelectric materials on a counter electrode of the mesoscopic perovskite solar cell through evaporation and deposition or growth technologies; and the mesoscopic perovskite solar cell is connected to the thermoelectric cells in series or in parallel The invention also discloses a preparation method of a stack device for the solar cell and the thermoelectric cell According to the solar cell and the preparation method thereof, through adoption of the brand-new structural design, the mesoscopic perovskite solar cell and the inorganic thermoelectric cells are stacked and integrated, and the corresponding preparation method is adopted to integrate, so that through the prepared solar cell, the influence on the service life of the device is avoided, the service life and the stability of the solar cell are improved, and more important, the utilization rate of the solar power is greatly improved