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Kaneko, Ryuji,Chowdhury, Towhid H.,Wu, Guohua,Kayesh, Md. Emrul,Kazaoui, Said,Sugawa, Kosuke,Lee, Jae-Joon,Noda, Takeshi,Islam, Ashraful,Otsuki, Joe Elsevier 2019 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.181 No.-
<P><B>Abstract</B></P> <P>We have synthesized cobalt-doped NiO<I> <SUB>x</SUB> </I> nanoparticles containing 0.5, 1, 2, 5 and 10 mol% cobalt ions and have investigated their electronic properties, which can be processed into smooth and pinhole-free layers at low temperature (<150 °C) as hole transport layers (HTLs) for perovskite solar cells (PSCs). We have revealed that the relationship between conductivity of HTLs and hole extraction properties to improve the photovoltaic performance. The thin film of cobalt-doped NiO<I> <SUB>x</SUB> </I> nanoparticles showed higher conductivities compared to pristine NiO<I> <SUB>x</SUB> </I> nanoparticles. Consequently, PSCs with power conversion efficiencies over 14.5%, an improvement from 11.5% for those with the pristine NiO<I> <SUB>x</SUB> </I>-based HTL, have been obtained. This work will contribute to the development of doped metal oxide HTLs, which are processable at low temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiO<I> <SUB>x</SUB> </I> nanoparticles with different concertation of cobalt ions are synthesized. </LI> <LI> Co-NiO<I> <SUB>x</SUB> </I> layers are fabricated at low-temperature process as a hole transport layer. </LI> <LI> The band alignment is optimized by decreased work function of Co-NiO<I> <SUB>x</SUB> </I> layer. </LI> <LI> The conductivity of Co-NiO<I> <SUB>x</SUB> </I> films is improved to 6.20 × <SUP> 10 - 6 </SUP> S <SUP> c m - 1 </SUP> . </LI> <LI> Conversion efficiency is improved to 14.5% using 1 mol% Co-NiO<I> <SUB>x</SUB> </I>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chowdhury, Towhid H.,Kaneko, Ryuji,Kayesh, Md. Emrul,Akhtaruzzaman, Md.,Sopian, Kamaruzzaman Bin,Lee, Jae-Joon,Islam, Ashraful Elsevier 2018 Materials letters Vol.223 No.-
<P><B>Abstract</B></P> <P>In this letter, we report on nanostructured NiO<SUB>x</SUB> with particle size ∼85 nm as an efficient hole transport material (HTM) for low temperature processed inverted planar perovskite solar cell (PSC) with power conversion efficiency of 15.64%. The homogenous NiO<SUB>x</SUB> HTM layer facilitated the growth of high quality CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> absorber with large crystal grains and the resulting PSC showed stable photovoltaic performance under continuous illumination.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanostructured NiO<SUB>x</SUB> has been synthesized. </LI> <LI> Low temperature PSCs showed power conversion efficiency of 15.64% with NiO<SUB>x</SUB> HTMs. </LI> <LI> The PSC showed stable performance under continuous illumination in 30 days. </LI> </UL> </P>
Emrul Kayesh, Md.,Matsuishi, Kiyoto,Chowdhury, Towhid H.,Kaneko, Ryuji,Lee, Jae-Joon,Noda, Takeshi,Islam, Ashraful Elsevier 2018 THIN SOLID FILMS - Vol.663 No.-
<P><B>Abstract</B></P> <P>The stability of perovskite solar cells (PSCs) are critically related to the perovskite crystal morphology and film quality, hence controlling the perovskite film formation is one of the key concerns. In this study, we have used four anti-solvents- toluene, chlorobenzene, <I>p</I>-xylene and ether to fabricate high quality CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite films. We investigated the surface morphology, optical and structural properties of the corresponding perovskite films. Consequently, PSCs with variation of these anti-solvents were fabricated and the respective photovoltaic performances over a period of 30 days in dark and under air mass 1.5G sunlight conditions have been observed. Our analyses onto the post fabrication of PSCs highlight that, the perovskite films formed by toluene, chlorobenzene and <I>p</I>-xylene treatment results in high efficient and stable PSCs in dark. Interestingly, the ether treated PSC had no photovoltaic response after 10 days. The toluene and chlorobenzene treated PSCs showed stable device performance and retained ̴ 90% of their initial power conversion efficiency even after 30 days light soaking. The <I>p</I>-xylene treated PSCs showed unstable performance during the same light soaking period.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anti-solvent dependent properties of perovskite films have been studied. </LI> <LI> PSCs based on four anti-solvents treatment with high PCE have been fabricated. </LI> <LI> Stability dependent photovoltaic response on anti-solvents has been observed. </LI> </UL> </P>
Chowdhury, Towhid H.,Akhtaruzzaman, Md.,Kayesh, Md. Emrul,Kaneko, Ryuji,Noda, Takeshi,Lee, Jae-Joon,Islam, Ashraful Elsevier 2018 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.171 No.-
<P><B>Abstract</B></P> <P>Low temperature processed Perovskite solar cells (PSCs) are popular due to their potential for scalable production. In this work, we report reduced Graphene Oxide (r-GO)/copper (I) thiocyanate (CuSCN) as an efficient bilayer hole transport layer (HTL) for low temperature processed inverted planar PSCs. We have systematically optimized the thickness of CuSCN interlayer at the r-GO/MAPbI<SUB>3</SUB> interface resulting in bilayer HTL structure to enhance the stability and photovoltaic performance of low temperature processed r-GO HTL based PSCs with a standard surface area of 1.02 cm<SUP>2</SUP>. With matched valence band energy level, the r-GO/CuSCN bilayer HTL based PSCs showed high power conversion efficiency of 14.28%, thanks to the improved open circuit voltage (V<SUB>OC</SUB>) compared to the only r-GO based PSC. Moreover, enhanced stability has been observed for the r-GO/CuSCN based PSCs which retained over 90% of its initial efficiency after 100 h light soaking measured under continuous AM 1.5 sun illumination.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel r-GO/CuSCN bilayer HTL was fabricated for inverted planar perovskite solar cells (PSCs). </LI> <LI> The r-GO/CuSCN bilayer HTL based PSC showed power conversion efficiency up to 14.28%. </LI> <LI> The r-GO/CuSCN bilayer HTL based PSC showed stable photovoltaic performance for 100 h. </LI> </UL> </P>
Md. Emrul Kayesh,Kiyoto Matsuishi,Towhid H. Chowdhury,Ryuji Kaneko,Takeshi Noda,Ashraful Islam 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.6
In this letter, we have introduced copper chloride (CuCl 2 ) as an additive in the CH 3 NH 3 PbI 3 precursor solution to improvethe surface morphology and crystallinity of CH 3 NH 3 PbI 3 fi lms in a single solvent system. Our optimized perovskite solarcells (PSCs) with 2.5 mol% CuCl 2 additive showed best power conversion effi ciency (PCE) of 15.22%. The PCE of the PSCsfabricated by CuCl 2 (2.5 mol%) additive engineering was 56% higher than the PSC fabricated with pristine CH 3 NH 3 PbI 3 .