Molang Cai
Chinese Academy of Sciences
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Publication
Featured researches published by Molang Cai.
Chemical Communications | 2013
Haiwei Chen; Xu Pan; Weiqing Liu; Molang Cai; Dongxing Kou; Zhipeng Huo; Xiaqin Fang; Songyuan Dai
A simple solution-processing method was employed to fabricate panchromatic mp-TiO2/CH3NH3PbI3/P3HT-MWNT/Au solar cells. MWNTs in a P3HT-MWNT composite acted as efficient nanostructured charge transport tunnels and induce crystallization of P3HT, hence significantly enhancing the conductivity of the composite. The fill factor of the hybrid solar cells was greatly enhanced by 26.7%.
Journal of Materials Chemistry | 2013
Molang Cai; Xu Pan; Weiqing Liu; Jiang Sheng; Xiaqin Fang; Changneng Zhang; Zhipeng Huo; Huajun Tian; Shangfeng Xiao; Songyuan Dai
Electron recombination and dye aggregation at the dyed-TiO2/electrolyte interface are still problems in dye-sensitized solar cell (DSC) research. In this paper, tributyl phosphate (TBpp) as a special additive to modify the dyed-TiO2/electrolyte interface was introduced to enhance the photovoltaic performance. The adsorption mode of TBpp and the interaction between cis-dithiocyanate-N,N′-bis-(4-carboxylate-4-tetrabutylammonium carboxylate-2,2′-bi-pyridine) ruthenium(II) (N719) and TBpp were investigated. It was found that one TBpp parent molecule split into several smaller fragments and formed four anchoring modes on the TiO2 surface. It was very interesting that the molecular cleavage of TBpp and adsorption of N719 assisted each other on the sensitized TiO2 surface. The fragments distributed around N719 result in steric hindrance, consequently hydrogen-bonding among N719 molecules was decreased. The unstable type N719 transformed into stable type N719 accompanied by molecular cleavage of TBpp and the N719 aggregation was reduced. Furthermore, these new fragments were multiply adsorbed on the non-sensitized TiO2 surface to form an insulating barrier layer. Therefore, the electron recombination at the dyed-TiO2/electrolyte interface was restrained. Besides the change of surface configuration, the TiO2 band edge negatively shifted and the rate of electron transport in the TiO2 films decreased with the addition of TBpp. As a result, an increase in the photoelectric conversion efficiency (η) was obtained of almost 40%.
RSC Advances | 2015
Molang Cai; Xu Pan; Weiqing Liu; John Bell; Songyuan Dai
A factor that limits the performance of dye-sensitized solar cells (DSC) based on ionic liquids is the disappearance of electron density due to electron recombination at the Dyed-TiO2/electrolyte interface. Adding an additive to the electrolyte can affect processes related to the kinetics of the electron recombination. In this paper a novel solid state additive, 1,2-dimethylimidazolium-3-propylsulfonate (DMImBS), was synthesized in an autoclave and directly applied to a DSC based on an ionic liquid electrolyte to form a molecular insulator layer. It was found that the presence of DMImBS in the ionic liquid electrolyte enhances both the open circuit photovoltage (Voc) and fill factor (FF) without significant penalizing the photocurrent (Jsc), as well as significantly increasing the power output of the DSC. This is suggested to be mainly due to the passivation of surface states, which effectively reduces electron recombination and restrains the Li+ intercalation. The device based on DMImBS also showed outstanding stability under prolonged light soaking at 50 °C, maintaining 100% photovoltaic efficiency.
Journal of Nanoscience and Nanotechnology | 2016
Molang Cai; John Bell; Songyuan Dai
The pyridine derivatives are added into acetonitrile based electrolyte to establish framework, then form the quasi solid electrolyte. The ion diffusion of cetylpyridinium chloride and cetylpyridinium bromide based electrolytes is enhanced comparing with the ion diffusion of reference acetonitrile electrolyte. The ordered structure of cetylpyridinuium chloride quasi solid electrolyte has been observed by SEM images. Light scattering effect of cetylpyridinuium chloride quasi solid electrolyte is evidenced by the larger resulted by transmitted and scattered spectra. The light harvesting efficiency of device based on C16Cl is much higher than acetonitrile based device. The cell efficiency of C16Cl and C16Br based device are 5.72% and 6.02%, which are 41% and 48% higher than acetonitrile liquid electrolyte based device. The C16l based device produces low cell efficiency 2.06%, which is 49% decrease compare to the blank device due to the limitation of iodide-triodide transportation in the iodide framework.
Journal of Power Sources | 2010
Zhipeng Huo; Changneng Zhang; Xiaqin Fang; Molang Cai; Songyuan Dai; Kongjia Wang
Journal of Physical Chemistry C | 2010
Weiqing Liu; Dongxing Kou; Molang Cai; Linhua Hu; Jiang Sheng; Huajun Tian; Nianquan Jiang; Songyuan Dai
Journal of Molecular Liquids | 2011
Lei Guo; Xu Pan; Changneng Zhang; Meng Wang; Molang Cai; Xiaqin Fang; Songyuan Dai
Archive | 2012
Xu Pan; Meng Wang; Lei Guo; Molang Cai; Songyuan Dai
Science & Engineering Faculty | 2016
Miaoqiang Lyu; Jung-Ho Yun; Molang Cai; Yalong Jiao; Paul V. Bernhardt; Meng Zhang; Qiong Wang; Aijun Du; Hongxia Wang; Gang Liu; Lianzhou Wang
Science & Engineering Faculty | 2016
Tubshin Hreid; Vincent Tiing Tiong; Molang Cai; Hongxia Wang; Geoffrey Will