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perovskite solar cell

Sisi Xiang, Weiping Li, Ya Wei, Jiaming Liu, Huicong Liu, Liqun Zhu, Haining Chen
α-CsPbI3 with the most suitable band gap for all-inorganic perovskite solar cell (PSC) application faces an issue of phase instability at low temperature in an air atmosphere. Herein, through stoichiometric investigation, α-CsPbI3 is successfully obtained with excess CsI at 110 °C in an air atmosphere. By doping α-CsPbI3 with Sb, phase stability is further enhanced and the film morphology is also improved. Carbon-based perovskite solar cells (C-PSCs) based on CsPb0.96Sb0.04I3 achieve a promising power conversion efficiency (PCE) of 5...
May 18, 2018: Nanoscale
Jing Cao, Xudong Lv, Peng Zhang, Tracy T Chuong, Binghui Wu, Xiaoxia Feng, Changfu Shan, Jiacheng Liu, Yu Tang
The poor UV, thermal, and interfacial stability of perovskite solar cells (PSCs) makes it highly challenging for their technological application, and has drawn increasing attention to resolving the above issues. In nature, plants generally sustain long exposure to UV illumination without damage, which is attributed to the presence of the organic materials acting as sunscreens. Inspired by the natural phenomenon, a natural plant sunscreen, sinapoyl malate, an ester derivative of sinapic acid, is employed to modify the surface of electron transport materials (ETMs)...
May 17, 2018: Advanced Materials
Le Zhang, Wei Geng, Chuan-Jia Tong, Xueguang Chen, Tengfei Cao, Mingyang Chen
Methyl-ammonium lead iodide perovskite (CH3 NH3 PbI3 ) has drawn great attention due to its excellent photovoltaic properties. Because of its loosely compacted structure, the structural, electronic and optical properties of CH3 NH3 PbI3 are sensitive to external modulations. Strain effects on CH3 NH3 PbI3 are fully investigated by the first principles calculations. The results indicate that the inorganic framework deforms under compression or stretch and the embedded organic CH3 NH3 + molecules rotate correspondingly...
May 17, 2018: Scientific Reports
Federico Bella, Polyssena Renzi, Carmen Cavallo, Claudio Gerbaldi
Perovskite solar cells have the potential to revolutionize the world of photovoltaics, and their efficiency close to 23% on a lab-scale recently certified this novel technology as the one with the most rapidly raising performance per year in the whole story of solar cells. With the aim of improving stability, reproducibility and spectral properties of the devices, in the last three years the scientific community strongly focused on Cs-doping for hybrid (typically, organolead) perovskites. In parallel, in order to further contrast hygroscopicity and reach thermal stability, research has also been carried out to achieve the development of all-inorganic perovskites based on caesium, the performances of which are actually rapidly increasing...
May 17, 2018: Chemistry: a European Journal
You-Jyun Chen, Ming-Hsien Li, Jung-Chun-Andrew Huang, Peter Chen
Cu/Cu2 O films grown by ion beam sputtering were used as p-type modified layers to improve the efficiency and stability of perovskite solar cells (PSCs) with an n-i-p heterojunction structure. The ratio of Cu to Cu2 O in the films can be tuned by the oxygen flow ratio (O2 /(O2  + Ar)) during the sputtering of copper. Auger electron spectroscopy was performed to determine the elemental composition and chemical state of Cu in the films. Ultraviolet photoelectron spectroscopy and photoluminescence spectroscopy revealed that the valence band maximum of the p-type Cu/Cu2 O matches well with the perovskite...
May 16, 2018: Scientific Reports
Xiao-Yu Yang, Hao-Sheng Lin, Il Jeon, Yutaka Matsuo
Aryl[60]fullerenyl cations (ArC60 + ), which were generated by heating aryl[60]fullerenyl dimers (ArC60 -C60 Ar) to generate aryl[60]fullerenyl radicals (ArC60 • ) followed by oxidation using Cu(II) salts (Cu(BF4 )2 (aq)), were reacted with various functionalized aryl boronic acids to produce functionalized 1,4-diaryl[60]fullerenes. This protocol tolerated various functional groups, such as OH, NH2 , COCH3 , and Cl substituents, with yields reaching 93%. C60 Ar1 Ar2 (Ar2 = p-NH2 C6 H4 ) was used as a dopant in a photoactive CH3 NH3 PbI3 layer of a perovskite solar cell...
May 15, 2018: Organic Letters
Jorge Pascual, Juan Luis Delgado, Ramon Tena-Zaera
Beyond the use of fullerenes as electron-transporting layers in perovskite solar cells, their introduction in the perovskite active layer has been ascertained as a very promising strategy for device improvement. In this sense, this perspective summarizes the studies in which perovskite:fullerene systems were employed, covering the different methodologies for introducing fullerenes inside the perovskite layer. In particular, fill factor was the most benefited parameter, what was ascribed to minimized pinhole density and fullerene passivating role...
May 15, 2018: Journal of Physical Chemistry Letters
Soeun Im, Wanjung Kim, Wonseok Cho, Dongguen Shin, Do Hyung Chun, Ryan Rhee, Jung Kyu Kim, Yeonjin Yi, Jong Hyeok Park, Jung Hyun Kim
Even though poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been commonly used as a hole extraction layer (HEL) for p-i-n perovskite solar cells (PSCs), the cells' photovoltaic performance deteriorates because of the low and unstable work functions (WFs) of PEDOT:PSS versus those of a perovskite layer. To overcome this drawback, we synthesized a copolymer (P(SS-co-TFPMA)) ionomer consisting of PSS and tetrafluoropropylmethacrylate (TFPMA) as an alternative to conventional PEDOT:PSS. The PEDOT:P(SS-co-TFPMA) copolymer solution and its film exhibited excellent homogeneity and high phase stability compared with a physical mixture of TFPMA with PEDOT:PSS solution...
May 15, 2018: ACS Applied Materials & Interfaces
Yongchao Ma, Jihoon Lee, Yanliang Liu, Pesi Mwitumwa Hangoma, Woon Ik Park, Jae-Hong Lim, Yun Kyung Jung, Jung Hyun Jeong, Sung Heum Park, Kwangho Kim
A cost-effective fabrication method that can produce a remarkable enhancement in the device efficiency along with a reduction in the fabrication cost is one of the crucial requirements for the commercialization of perovskite-based solar cells. Here, we report a low-cost, printable, and highly effective synchronized-pressing annealing (SPA) method for inverted planar perovskite solar cells. In this method, two films are combined face-to-face for annealing, and separated as in a roll-to-roll process. Consequently, the SPA method provides two homogeneous highly crystalline MAPbI3 films with monolithic millimeter-scale crystalline grains by intermediate-induced crystallization engineering...
May 14, 2018: Nanoscale
Zhenlong Zhang, Jianqiang Qin, Wenjia Shi, Yanyan Liu, Yan Zhang, Yuefeng Liu, Huiping Gao, Yanli Mao
In this paper, Er3+ -Yb3+ -Li+ tri-doped TiO2 (UC-TiO2 ) was prepared by an addition of Li+ to Er3+ -Yb3+ co-doped TiO2 . The UC-TiO2 presented an enhanced up-conversion emission compared with Er3+ -Yb3+ co-doped TiO2 . The UC-TiO2 was applied to the perovskite solar cells. The power conversion efficiency (PCE) of the solar cells without UC-TiO2 was 14.0%, while the PCE of the solar cells with UC-TiO2 was increased to 16.5%, which presented an increase of 19%. The results suggested that UC-TiO2 is an effective up-conversion material...
May 11, 2018: Nanoscale Research Letters
Zhen Huang, Duofa Wang, Song Wang, Tianjin Zhang
Perovskite solar cells have attracted great attention in recent years, due to their high conversion efficiency and solution-processable fabrication. However, most of the solar cells with high efficiency in the literature are prepared employing TiO₂ as electron transport material, which needs sintering at a temperature higher than 450 °C, and is not applicable to flexible device and low-cost fabrication. Herein, the MAPbI₃ perovskite solar cells are fabricated at a low temperature of 150 °C with SnO₂ as the electron transport layer...
May 11, 2018: Materials
Minghua Li, Xiaoqin Yan, Zhuo Kang, Yahuan Huan, Yong Li, Ruxiao Zhang, Yue Zhang
The major restraint for the commercialization of the high-performance hybrid metal halide perovskite solar cells is the long-term stability, especially at the infirm interface between the perovskite film and organic charge transfer layer. Recently, engineering the interface between the perovskite and spiro-OMeTAD becomes an effective strategy to simultaneously improve the efficiency and stability in the perovskite solar cells. In this work, we demonstrated that introducing an interfacial polystyrene layer between the perovskite film and spiro-OMeTAD layer can effectively improve the perovskite solar cells photovoltaic performance...
May 11, 2018: ACS Applied Materials & Interfaces
Ernestas Kasparavicius, Artiom Magomedov, Tadas Malinauskas, Vytautas Getautis
Vast majority of the hole transporting materials require the use of chemical doping as an essential step for preparation of efficient perovskite solar cells. Oxidized organic hole transporting material, obtained during doping procedure, could potentially be one of the weak links in the device composition. It's not uncommon for the solar cell to heat up under summer sun; therefore, all device components must possess some degree of resistance to repetitive thermal stress. In the current publication a series of oxidized hole transporting materials have been synthesized and their long-term stability investigated...
May 9, 2018: Chemistry: a European Journal
Xin Li, Junyou Yang, Qinghui Jiang, Hui Lai, Shuiping Li, Jiwu Xin, Weijing Chu, Jingdi Hou
For a typical perovskite solar cell (PKSC), electron transport layer (ETL) has a great effect on device performance and stability. In this paper, for the first time, we manifest that low-temperature solution-processed ZnSe can be used as a potential ETL for PKSCs. Our optimized device with ZnSe ETL has achieved high power conversion efficiency (PCE) of 17.78 % with negligible hysteresis, compared with the TiO2 based cell (13.76%). This enhanced photovoltaic performance is attributed the suitable band alignment, high electron mobility and reduced charge accumulation at the interface of ETL/perovskite...
May 9, 2018: ACS Nano
Yungen Wu, Zhihui Wang, Mao Liang, Hua Cheng, Mengyuan Li, Liyuan Liu, Baiyue Wang, Jinhua Wu, Raju Prasad Ghimire, Xuda Wang, Zhe Sun, Song Xue, Qiquan Qiao
The core plays a crucial role in achieving high performance of linear hole transport materials (HTMs) toward the perovskite solar cells (PSCs). Most studies focused on the development of fused heterocycles as cores for HTMs. Nevertheless, non-fused heterocycles deserve to be studied since they can be easily synthesized. In this work, we reported a series of low cost of triphenylamine HTMs (M101-106) with different non-fused cores. Results concluded that the introduced core has a significant influence on conductivity, hole mobility, energy level, and solubility of linear HTMs...
May 9, 2018: ACS Applied Materials & Interfaces
Yifan Zheng, Jaemin Kong, Di Huang, Wei Shi, Lyndsey McMillon-Brown, Howard E Katz, Junsheng Yu, André D Taylor
The p-i-n structure for perovskite solar cells has recently shown significant advantages in minimal hysteresis effects, and scalable manufacturing potential using low-temperature solution processing. However, the power conversion efficiency (PCE) of the perovskite p-i-n structure remains low mainly due to limitations using a flat electron transport layer (ETL). In this work, we demonstrate a new approach using spray coating to fabricate the [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) ETL. By creating a rough surface, we effectively improve the light trapping properties inside the PCBM ETL...
May 9, 2018: Nanoscale
Yong Zhang, Seul-Gi Kim, Do-Kyoung Lee, Nam-Gyu Park
High-efficiency perovskite solar cells are generally fabricated by using highly pure (>99.99 %) PbI2 mixed with an organic iodide in polar aprotic solvents. However, the use of such an expensive chemical may impede progress toward large-scale industrial applications. Here, we report on the synthesis of perovskite powders by using inexpensive low-grade (99 %) PbI2 and on the photovoltaic performance of perovskite solar cells prepared from a powder-based single precursor. Pure APbI3 [A=methylammonium (MA) or formamidinium (FA)] perovskite powders were synthesized by treating low-grade PbI2 with MAI or FAI in acetonitrile at ambient temperature...
May 9, 2018: ChemSusChem
Lung-Chien Chen, Kuan-Lin Lee, Wen-Ti Wu, Chien-Feng Hsu, Zong-Liang Tseng, Xiao Hong Sun, Yu-Ting Kao
In this study, the perovskite layers were prepared by two-step wet process with different CH3 NH3 I (MAI) concentrations. The cell structure was glass/FTO/TiO2 -mesoporous/CH3 NH3 PbI3 (MAPbI3 )/spiro-OMeTAD/Ag. The MAPbI3 perovskite films were prepared using high and low MAI concentrations in a two-step process. The perovskite films were optimized at different spin coating speed and different annealing temperatures to enhance the power conversion efficiency (PCE) of perovskite solar cells. The PCE of the resulting device based on the different perovskite morphologies was discussed...
May 8, 2018: Nanoscale Research Letters
Kyle Frohna, Tejas Deshpande, John Harter, Wei Peng, Bradford A Barker, Jeffrey B Neaton, Steven G Louie, Osman M Bakr, David Hsieh, Marco Bernardi
Methylammonium lead iodide perovskite (MAPbI3 ) exhibits long charge carrier lifetimes that are linked to its high efficiency in solar cells. Yet, the mechanisms governing these unusual carrier dynamics are not completely understood. A leading hypothesis-disproved in this work-is that a large, static bulk Rashba effect slows down carrier recombination. Here, using second harmonic generation rotational anisotropy measurements on MAPbI3 crystals, we demonstrate that the bulk structure of tetragonal MAPbI3 is centrosymmetric with I4/mcm space group...
May 8, 2018: Nature Communications
Yaoguang Rong, Yue Ming, Wenxian Ji, Da Li, Anyi Mei, Yue Hu, Hongwei Han
Perovskite solar cells (PSCs) have attracted intensive attention of the researchers and industry due to their high efficiency, low material cost, and simple solution-based fabrication process. Along with the development of device configurations, materials, and fabrication techniques, the efficiency has rapidly increased from the initial 3.8 to recent 22.7%. However, fundamental studies on PSCs are usually yielded through lab-scale procedures and carried out on small-area (≤1 cm2 ) devices. Recently, various deposition methods, such as screen printing, slot-die coating, soft-cover coating, spraying coating, etc...
May 8, 2018: Journal of Physical Chemistry Letters
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