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All inorganic perovskite solar cells using hot-air method: influence of metal ion dopants
( Sawanta S. Mali ),홍창국 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The growth in popularity and substantial improvement in the efficiency of perovskites since their discovery in 2009 is demonstrated by over 6000 publications in 2018. Although, the current world record efficiency has been reported for organic-inorganic halide perovskite, all devices were fabricated in controlled inert conditions and organic cations suffer from poor stability. Therefore, replacement of conventional organic cations by inorganic cations is one of the most promising approaches to make thermally stable photovoltaics. However, all-inorganic perovskite solar cells (PSCs) (herein AIPSCs) composition and deposition techniques limit the real-time stability. This article previews the dynamic hot air (DHA) method used for making CsPbI2Br-based perovskites with improved air-thermal stability using barium (Ba2+) alkaline earth metal ion doping. Interestingly, the feasibility of this DHA method toward large area fabrication is also demonstrated.
Mali, Sawanta S.,Shim, Chang Su,Kim, Hyungjin,Hong, Chang Kook The Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.31
<P>Electron transporting materials based on ternary metal oxides (TMOs) are the best electron transport layers (ETLs) for perovskite solar cells (PSCs). In the present investigation, reduced graphene oxide (rGO) grafted highly porous zinc stannate (Zn2SnO4) (ZSO) nanofiber scaffolds have been synthesized by a single step electrospinning technique and successfully used as ETLs for mixed halide PSCs whose perovskite material is composed of MAPb(I1−xBrx)3and (FAPbI3)0.85(MAPbBr3)0.15(MA: methyl ammonium and FA: formamidinium). The fabricated optimized perovskite solar cells having FTO/Bl-ZSO/rGO-ZSO0.7-MAPb(I1−xBrx)3/PTAA/Au devices exhibited a 13.41% power conversion efficiency (PCE) with an open circuit voltage (<I>V</I>OC) of 1.036 V, a current density (<I>J</I>SC) of 19.62 mA cm<SUP>−2</SUP>and a fill factor (FF) of 0.66 under AM 1.5G sunlight (100 mW cm<SUP>−2</SUP>) which is higher than that of bare Zn2SnO4nanofiber (<I>η</I>= 7.38%) based PSCs. The optimized conditions were further used for formamidinium lead halide (FAPbI3)1−x(MAPbBr3)x(<I>x</I>= 0.15) perovskite and our optimized results show<I>η</I>= 17.89% PCE (<I>J</I>SC= 22.50 mA cm<SUP>−2</SUP>,<I>V</I>OC= 1.046 V, FF = 0.76) for the FTO/Bl-ZSO/rGO-ZSO0.7-(FAPbI3)0.85(MAPbBr3)0.15/PTAA/Au device configuration. The role of rGO grafting and electron transfer mechanisms are investigated with complementary characterization, including photoluminescence (PL) and time-resolved photoluminescence (TRPL) decay measurements. The TRPL results revealed that the grafting of rGO in ZSO scaffolds reduces the slow decay lifetime which facilitates efficient electron injection from the perovskite conduction band (CB) to the rGO Fermi level to the CB of ZSO compared to the bare ZSO ETL. Furthermore, the stability of these devices based on various configurations has been discussed. This improvement is achieved due to the high conductivity of rGO and grafting with high porosity Zn2SnO4nanofibers which make them promising new ETLs for the fabrication of highly efficient PSCs.</P>
Mali, Sawanta S.,Patil, Jyoti V.,Hong, Chang Kook The Royal Society of Chemistry 2019 Journal of materials chemistry. A, Materials for e Vol.7 No.17
<P>A long-term thermally stable, inexpensively produced, inorganic-hole extraction layer (i-HEL) is the best choice for the commercialization of air-thermo-stable, low-cost, highly-efficient perovskite solar cells (PSCs). Low-cost, thermally-stable inorganic copper(i) thiocyanate (CuSCN) i-HEL is the best choice. However, it has unique solubility in polar diethyl sulfide solvent and the conventional spin-coating method damages the perovskite layer, hampering large-area fabrication. In the present investigation we have developed a novel, simple smart-bottle-humidifier-assisted (SBHA) method for p-type CuSCN i-HEL deposition towards air-thermally stable low-cost PSCs. The developed method is very simple, ambient-air processed, cheap and could be suitable for large-area deposition. The best efficiency based on CuSCN i-HEL devices exhibited was 18.78% with >95% and >85% thermal stability over 1000 hours, respectively at 65 ± 1 and 85 ± 1 °C. Interestingly, CuSCN i-HEL-based devices show >2000 hours of air-stability and are much more stable than conventional expensive additive-doped spiro-MeOTAD-based PSCs. We also explored this technique for large-area (∼1.04 cm<SUP>2</SUP>) fabrication and it exhibited 18.34% PCE with >85% thermal stability at 85 ± 1 °C over 1000 hours, revealing that the developed method is also suitable for large-area perovskite fabrication.</P>
Mali, Sawanta S.,Kim, Hyungjin,Shim, Sang Eun,Hong, Chang Kook Royal Society of Chemistry 2016 Nanoscale Vol.8 No.46
<P>Here we report a solution processed nanostructured NiO as a hole transport layer (HTL) for efficient inverted MAPb(I1-xBrx)(3) (x = 0.3) perovskite solar cells (PSCs). The best performing p-i-n PSC exhibits 15.35% power conversion efficiency with a current density (J(SC)) of 19.85 mA cm(-2), an open circuit voltage (V-OC) of 1.056 V and a fill factor (FF) of 0.73. The developed method is simple and cost effective.</P>
Mali, Sawanta S.,Shim, Chang Su,Kim, Hyungjin,Patil, Jyoti V.,Ahn, Dong Hee,Patil, Pramod S.,Hong, Chang Kook Elsevier 2015 ELECTROCHIMICA ACTA Vol.166 No.-
<P><B>Abstract</B></P> <P>In the present investigation, anatase TiO<SUB>2</SUB> nanofibers with various diameters have been synthesized by electrospinning technique. The electrospinning feeding rate has been varied from 1.0, 1.5, 2.0 and 2.5ml.h<SUP>−1</SUP> in order to control the diameter of TiO<SUB>2</SUB> nanofibers. The synthesized nanofibers are characterized by X-ray diffraction (XRD), field emission scanning-and high resolution transmission electron microscopy (FESEM-HRTEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) measurements. From FESEM and XRD results it is clear that, the nanofibers diameter and crystallinity increases with respect to increasing feed rate. The synthesized nanofibers having various diameters further used for dye sensitized solar cells (DSSCs) application. Our controlled results show that, the nanofibers deposited at 1.5ml.h<SUP>−1</SUP> feeding rate exhibits promising 5.39% power conversion efficiency (PCE) with short circuit current density (J<SUB>SC</SUB>) 13.32mAcm<SUP>−2</SUP> and open circuit voltage (V<SUB>oc</SUB>)=0.698V. The detailed interface and transient properties of these nanofibers based DSSCs devices have been analyzed by electrochemical impedance spectroscopy (EIS), intensity modulated photocurrent/voltage spectroscopy (IMPS/IMVS) and open circuit voltage decay (OCVD) measurements.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anatase TiO<SUB>2</SUB> nanofiber by electrospinning technique. </LI> <LI> Variation of TiO<SUB>2</SUB> nanofiber diameter. </LI> <LI> Effect of electrospinning feed rate. </LI> <LI> Dye sensitized solar cell performance. </LI> <LI> Interface and charge transport properties </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>