ORCID Profile
0000-0002-6391-5270
Current Organisation
Chongqing University
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Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4PY01631A
Abstract: The effect of molecular weight of a conjugated polymer on its photophysical properties and solar cell device performance was investigated.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4PY00827H
Abstract: A new thienothiophene–benzodithiophene electron donor building block was synthesized and incorporated into 2-dimensional conjugated donor–acceptor polymers. The polymers were fully characterised and tested in bulk heterojunction solar cell devices.
Publisher: American Chemical Society (ACS)
Date: 21-05-2014
DOI: 10.1021/AM5015666
Abstract: The morphology of the active layer in organic photovoltaics (OPVs) is of crucial importance as it greatly influences charge generation and transport. A templating interlayer between the electrode and the active layer can change active layer morphology and influence the domain orientation. A series of hiphilic interface modifiers (IMs) combining a hydrophilic polyethylene-glycol (PEG) oligomer and a hydrophobic hexabenzocoronene (HBC) were designed to be soluble in PEDOT:PSS solutions, and surface accumulate on drying. These IMs are able to self-assemble in solution. When IMs are deposited on top of a poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) film, they induce a morphology change of the active layer consisting of discotic fluorenyl-substituted HBC (FHBC) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM). However, when only small amounts (0.2 wt %) of IMs are blended into PEDOT:PSS, a profound change of the active layer morphology is also observed. Morphology changes were monitored by grazing incidence wide-angle X-ray scattering (GIWAXS), transmission electron microscopy (TEM), TEM tomography, and low-energy high-angle angular dark-field scanning transmission electron microscopy (HAADF STEM). The interface modification resulted in a 20% enhancement of power conversion efficiency.
Publisher: American Chemical Society (ACS)
Date: 26-10-2018
Abstract: ZnO is a widely used electron transport material in third generation solar cells. Intrinsic defects arising from different synthetic methods and conditions lead to different fluorescent colors. The defect mechanisms have been explored in the literature, but their impact on organic photovoltaic (OPV) cell performance is rarely reported. Herein, three different ZnO nanoparticles showing blue, green, and yellow emission colors are synthesized and incorporated into OPV cells. The as-cast ZnO films result in vastly different OPV performances. It is found the sodium acetate as the byproduct of the synthesis can significantly influence the interfacial contact. After removing the impurity via rinsing with polar organic solvents, the different ZnO nanoparticles can deliver similar power conversion efficiencies (PCEs) in three representative OPV systems. The PCEs reached 4, 8, and 10% in P3HT:PC
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01125B
Publisher: Springer Science and Business Media LLC
Date: 16-07-2014
DOI: 10.1038/SREP05701
Publisher: Springer Science and Business Media LLC
Date: 14-01-2015
DOI: 10.1038/NCOMMS7013
Abstract: Solution-processed organic photovoltaic cells (OPVs) hold great promise to enable roll-to-roll printing of environmentally friendly, mechanically flexible and cost-effective photovoltaic devices. Nevertheless, many high-performing systems show best power conversion efficiencies (PCEs) with a thin active layer (thickness is ~100 nm) that is difficult to translate to roll-to-roll processing with high reproducibility. Here we report a new molecular donor, benzodithiophene terthiophene rhodanine (BTR), which exhibits good processability, nematic liquid crystalline behaviour and excellent optoelectronic properties. A maximum PCE of 9.3% is achieved under AM 1.5G solar irradiation, with fill factor reaching 77%, rarely achieved in solution-processed OPVs. Particularly promising is the fact that BTR-based devices with active layer thicknesses up to 400 nm can still afford high fill factor of ~70% and high PCE of ~8%. Together, the results suggest, with better device architectures for longer device lifetime, BTR is an ideal candidate for mass production of OPVs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TC31622J
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM35221D
Publisher: Wiley
Date: 04-08-2021
Abstract: Tunable crystal growth offering highly aligned perovskite crystallites with suppressed deep‐level defects is vital for efficient charge transport, which in turn significantly influences the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Herein, a “precursor to perovskite‐like template to perovskite” (PPP) growth strategy is developed, using either MAAc or GuaCl precursor to induce a sacrificial thermal–unstable perovskite‐like template for (FAPbI 3 ) x (MAPbI 3 ) y perovskite growth. The self‐sacrificed intermediate template induces the formation of highly aligned perovskite crystals with greatly enhanced film crystallinity and suppresses deep‐level defect formation. Furthermore, it is proved that MAAc or GuaCl completely evaporates during the high‐temperature annealing process. The reduction in defect densities and nonradiative recombination enhances both carrier lifetime and charge dynamics, yielding impressive PCEs of 22.3% and 22.8% with a high open‐circuit voltage ( V OC ) of 1.16 V and an incredible fill factor (FF) of 81.5% and 79.4% for MAAc‐ and GuaCl‐based devices, respectively. These results suggest that the formation of the thermal–unstable perovskite‐like sacrificial template is a promising strategy to restrain the deep‐level defects in perovskite films toward the attainment of highly efficient and stable large‐scale PSCs as well as other perovskite‐based electronics.
No related grants have been discovered for Kuan Sun.