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Title:	High efficiency large surface area perovskite solar cells with inorganic and organic hole transport materials
Authors:	Towhid Hossain Chowdhury (P69721)
Supervisor:	Md. Akhtaruzzaman, Assoc. Prof. Dr.
Keywords:	Perovskite
Issue Date:	17-May-2018
Description:	Perovskite solar cells (PSCs) have been identified as one of the key technologies for future energy generation with lower cost. Upon absorption of sunlight, the perovskite absorber generates electron-hole pairs which are extracted by their corresponding charge carrier transport materials such as electron transport material (ETM) for electron transportation and hole transport material (HTM) for hole extraction. However, hole extraction both in mesoporous and inverted planar structure over a large surface area of PSCs has remained critical. This work investigates the role of various HTMs in mesoporous and inverted planar structures with surface area of 1.02 cm2. The detailed structural, morphological, optical and electrical characterizations were investigated by X-ray-diffraction (XRD), photoluminescence (PL), ultraviolet photoelectron emission spectroscopy measurement (UPS), atomic force microscope (AFM), scanning electron microscope (SEM), ultraviolet-visible spectroscopy (UV-VIS), light current voltage (LIV) tester and incident photon to current conversion efficiency (IPCE) apparatus. For the inverted planar PSC, temperature dependent fabrication of NiOx HTM, GO HTM, CuSCN HTM and CuSCN as an interlayer has been evaluated in this study. For the mesoporous structure of the PSC structure, new HTMs designed and synthesized based on spiro[fluorene-9,9'-xanthene] conjugated systems and spiro-OMeTAD HTM has been studied. The high temperature deposited NiOx HTM based PSC showed 18.03% power conversion efficiency (PCE) with photovoltaic parameters (VOC=1.072V, JSC=23.47mA cm-2, FF=74.5%) and stable performance for 40 days. The low temperature NiOx HTM based inverted planar PSC showed 14.09% PCE (VOC=.966V, JSC=17.61 mA cm-2, FF =82.8%). The GO HTM based PSC showed PCE of 9.52% with VOC=.826V, JSC=17.45 mA cm-2, FF =66.0%. With CuSCN as HTM layer, the PCE of the PSC was increased up to 11.77% with increased JSC of 18.61 mA cm-2 and FF of 78.5%. With inclusion of 10 nm ultrathin CuSCN layer between the GO and Perovskite absorber, the PCE of the GO HTM based PSC was increased up to 14.28%. A high VOC of 1.031V with JSC of 18.21 mA cm-2 and FF of 76.1% contributed to the enhanced performance for the GO/CuSCN bilayer HTM based PSCs. The spiro[fluorene-9,9'-xanthene] conjugated system based HTMs- BTPA-4,BTPA-5 and BTPA-6 resulted in PCEs as high as 9.21%, 11.30% and 11.57% respectively in mesoporous PSCs. Under similar fabrication conditions, the spiro-OMeTAD HTM based PSCs showed efficiency as high as 13.25%. However, the organic BTPA-5 HTM based PSC showed best stability for 10 days. The analyzed experimental results have shown that large surface area inverted planar perovskite solar cells fabricated with NiOx and GO/CuSCN bilayer HTM promises higher photovoltaic performance. Where in the mesoporous structure, the BTPA-5 HTM based perovskite solar cell has optimal and stable performance.,Certification of Master's/Doctoral Thesis" is not available
Pages:	150
Call Number:	QE391.P47C486 2018 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Solar Energy Research Institute / Institut Penyelidikan Tenaga Suria (SERI)

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