Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Kah Howe Chan is active.

Publication


Featured researches published by Kah Howe Chan.


RSC Advances | 2016

Analysis of burn-in photo degradation in low bandgap polymer PTB7 using photothermal deflection spectroscopy

Mushfika Baishakhi Upama; Matthew Wright; Binesh Puthen-Veettil; Naveen Kumar Elumalai; Arafat Mahmud; Dian Wang; Kah Howe Chan; Cheng Xu; Faiazul Haque; Ashraf Uddin

The efficiency of organic photovoltaic devices continues to increase; however, their limited stability is currently a barrier to the commercial prospects of the technology. Burn-in photo degradation, caused by continuous illumination under a light source, can cause a significant reduction in device performance. Our aim was to investigate this degradation pathway for the high-efficiency polymer PTB7, which was compared to the well-studied P3HT:PC71BM material system. In this study, we compared the burn-in aging profile for organic solar cells containing either P3HT or PTB7 as the donor polymer. This showed that PTB7:PC71BM solar cells exhibit a severe initial reduction in performance, due mainly to reduced short circuit current density (Jsc), during the 5 hour test period. P3HT:PC71BM cells were relatively stable during this test. Photothermal deflection spectroscopy (PDS), which provides sensitive measurement of sub bandgap absorption, was employed to discover the underlying mechanism causing this discrepancy. In PTB7-based devices, a significant increase in sub bandgap absorption was observed after illumination, which was attributed to the formation of sub bandgap trap states. This mechanism was identified as a contributing factor to the severe burn-in for PTB7-based organic solar cells. No such increase was observed for P3HT:PC71BM films.


photovoltaic specialists conference | 2016

Effect of PCBM film thickness on the performance of inverted perovskite solar cells

Dian Wang; Naveen Kumar Elumalai; Arafat Mahmud; Mushfika Baishakhi Upama; Matthew Wright; Kah Howe Chan; Cheng Xu; Ashraf Uddin

The effect of electron transportation layer (ETL) PCBM film thickness was investigated for the performance of inverted structure perovskite solar cells. The charge transportation study was carried by Mott-Schottky analysis. The result shows the charge transportation status of different electron thickness. A thicker PCBM layer could provide better diode property, while the thinner layer would lead to higher short circuit current. For this perovskite fabrication method, the thicker film worked better. This study reveals the optimization of PCBM depends on various factors, like cathode, and perovskite films. To further improve the efficiency of devices, the perovskite film and the design of device structure are needed to be optimized.


photovoltaic specialists conference | 2016

Hysteresis and electrode polarization in normal and inverted hybrid perovskite solar cells

Naveen Kumar Elumalai; Arafat Mahmud; Dian Wang; Matthew Wright; Mushfika Baishakhi Upama; Kah Howe Chan; Cheng Xu; Ashraf Uddin

Organic-inorganic hybrid perovskite solar cells (PSCs) have demonstrated enormous potential to replace the traditional silicon photovoltaics. In spite of impressive progress, an in-depth understanding of various physiochemical and electronic properties of PSCs are yet to be unravelled. Anomalous hysteresis is one among them and its origin is a highly debated issue till date. In this work, the role of device structure and interfacial charge selective layer on the origin of hysteresis phenomenon was investigated. Normal devices with ZnO as electron transport layer exhibited excess interfacial capacitance in an order of magnitude higher than inverted devices with PCBM. Current-voltage characteristics correlated with capacitance measurements revealed that the electrode polarization as a consequence of ion migration and interfacial defect states might be a possible origin for hysteresis in PSCs.


photovoltaic specialists conference | 2016

Augmentation of optoelectronic properties via P3HT doping for low temperature processed perovskite solar cell

Arafat Mahmud; Naveen Kumar Elumalai; Mushfika Baishakhi Upama; Dian Wang; Matthew Wright; Kah Howe Chan; Cheng Xu; Ashraf Uddin

Methyl Ammonium Lead Halide Perovskite solar have shown immense potential to be a “Game Changer” in the photovoltaic industry. Major barriers to commercialization of Perovskite solar cells are poor device stability and high temperature requirement with TiO2 electron transport layer, widely used in efficient Perovskite devices. Apart from severe moisture sensitivity and thermal degradation, Perovskite layer can be decomposed due to the TBP additive incorporation with Li-TFSI dopant in most commonly used hole transport layers like Spiro OMeTAD and P3HT. Nearly 5000 C sintering temperature requirement for Titania electron transport layer also impedes the Perovskite manufacturing in roll-to-roll process on flexible substrate which has a stringent processing condition of sub 1500 C temperature. In this work, we have introduced F4TCNQ dopant to replace TBP and Li-TFSI in P3HT HTL in a low temperature (<;1500 C) solgel ZnO ETL processed Methyl Ammonium Lead Triiodide Perovskite solar cell. F4TCNQ doped P3HT HTL devices have shown over two times higher power conversion efficiency compared to pristine P3HT HTL devices. To comprehend the performance enhancement with F4TCNQ dopant in P3HT, we have examined the optical and electronic properties of both the pristine and F4TCNQ doped P3HT devices. Absorbance of Perovskite film lying underneath the undoped and the F4TCNQ doped P3HT film has been investigated to understand superior optical property of F4TCNQ incorporated film. Mott Schottky analysis has been conducted to enunciate the enhanced electronic property with F4TCNQ dopant in P3HT HTL compared to pristine P3HT.


Solar Energy Materials and Solar Cells | 2017

Low temperature processed ZnO thin film as electron transport layer for efficient perovskite solar cells

Arafat Mahmud; Naveen Kumar Elumalai; Mushfika Baishakhi Upama; Dian Wang; Kah Howe Chan; Matthew Wright; Cheng Xu; Faiazul Haque; Ashraf Uddin


Electrochimica Acta | 2016

Single Vs Mixed Organic Cation for Low Temperature Processed Perovskite Solar Cells

Arafat Mahmud; Naveen Kumar Elumalai; Mushfika Baishakhi Upama; Dian Wang; Matthew Wright; Kah Howe Chan; Cheng Xu; Faiazul Haque; Ashraf Uddin


Current Applied Physics | 2017

High performance semitransparent organic solar cells with 5% PCE using non-patterned MoO3/Ag/MoO3 anode

Mushfika Baishakhi Upama; Matthew Wright; Naveen Kumar Elumalai; Arafat Mahmud; Dian Wang; Kah Howe Chan; Cheng Xu; Faiazul Haque; Ashraf Uddin


Organic Electronics | 2014

Performance improvement of low bandgap polymer bulk heterojunction solar cells by incorporating P3HT

Rui Lin; Matthew Wright; Kah Howe Chan; Binesh Puthen-Veettil; Rui Sheng; Xiaoming Wen; Ashraf Uddin


Physica Status Solidi-rapid Research Letters | 2016

Enhanced stability of low temperature processed perovskite solar cells via augmented polaronic intensity of hole transporting layer

Md. Arafat Mahmud; Naveen Kumar Elumalai; Mushfika Baishakhi Upama; Dian Wang; Faiazul Haque; Matthew Wright; Kah Howe Chan; Cheng Xu; Ashraf Uddin


Applied Surface Science | 2017

Interfacial engineering of electron transport layer using Caesium Iodide for efficient and stable organic solar cells

Mushfika Baishakhi Upama; Naveen Kumar Elumalai; Arafat Mahmud; Matthew Wright; Dian Wang; Cheng Xu; Faiazul Haque; Kah Howe Chan; Ashraf Uddin

Collaboration


Dive into the Kah Howe Chan's collaboration.

Top Co-Authors

Avatar

Ashraf Uddin

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Matthew Wright

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Cheng Xu

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Dian Wang

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Naveen Kumar Elumalai

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Arafat Mahmud

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Faiazul Haque

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Binesh Puthen-Veettil

University of New South Wales

View shared research outputs
Top Co-Authors

Avatar

Rui Lin

University of New South Wales

View shared research outputs
Researchain Logo
Decentralizing Knowledge