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https://www.readbyqxmd.com/read/28812747/identifying-the-charge-generation-dynamics-in-cs-based-triple-cation-mixed-perovskite-solar-cells
#1
Manuel Salado, Ramesh K Kokal, Laura Calio, Samrana Kazim, Melepurath Deepa, Shahzada Ahmad
Triple cation based perovskite solar cells offer enhanced moisture tolerance and stability compared to mixed perovskites. Slight substitution of methyl ammonium or formamidinium cation by cesium (Cs(+)), was also reported to eliminate halide segregation due to its smaller size. To elucidate the device kinetics and understand the role of the Cs, we undertook different modes of scanning probe microscopy and electrochemical impedance spectroscopy (EIS) experiments. Kelvin probe force microscopy revealed that the incorporation of the Cs cation increases the contact potential difference (CPD), this CPD further increases when Spiro-OMeTAD is used as a hole transport material...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28812350/green-solvent-processable-dopant-free-hole-transporting-materials-for-robust-and-efficient-perovskite-solar-cells
#2
Junwoo Lee, Mahdi Malekshahi Byranvand, Gyeongho Kang, Sung Y Son, Seulki Song, Guan-Woo Kim, Taiho Park
In addition to having proper energy levels and high hole mobility (μh) without the use of dopants, hole-transporting materials (HTMs) used in n-i-p-type perovskite solar cells (PSCs) should be processed using green solvents to enable environmentally friendly device fabrication. Although many HTMs have been assessed, owing to the limited solubility of HTMs in green solvents, no green-solvent-processable HTM has been reported to date. Here we report on a green-solvent-processable HTM, an asymmetric D-A polymer (asy-PBTBDT) that exhibits superior solubility even in the green solvent, 2-methylanisole, which is a known food additive...
August 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28805366/simultaneous-top-and-bottom-perovskite-interface-engineering-by-fullerene-surface-modification-of-titanium-dioxide-as-electron-transport-layer
#3
John Ciro, Santiago Mesa, Juan Felipe Montoya, Jose Ignacio Uribe, Rafael Betancur, Franklin Jaramillo
Optimization of the interface between the electron transport layer (ETL) and hybrid perovskite is crucial to achieve high performance perovskite solar cell (PSC) devices. Fullerene-based compounds have attracted attention as modifiers on the surface properties of TiO2, the archetypal ETL in regular n-i-p PSCs. However, the partial solubility of fullerenes in the aprotic solvents used for perovskite deposition hinders its application to low-temperature solution-processed PSCs. In this work, we introduce a new method for fullerene modification of TiO2 layers derived from nanoparticles (NPs) inks...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805216/anthracene-arylamine-hole-transporting-materials-for-perovskite-solar-cells
#4
Xuepeng Liu, Fantai Kong, Rahim Ghadari, Shengli Jin, Ting Yu, Wangchao Chen, Guozhen Liu, Zhan'ao Tan, Jian Chen, Songyuan Dai
Two arylamine-based hole transporting materials with an anthracene π-linker have been synthesized and tested for perovskite solar cells. Improved power conversion efficiency and stability were achieved by employing A102 compared with that of spiro-OMeTAD.
August 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28805062/ultrafast-electron-dynamics-in-solar-energy-conversion
#5
Carlito S Ponseca, Pavel Chábera, Jens Uhlig, Petter Persson, Villy Sundström
Electrons are the workhorses of solar energy conversion. Conversion of the energy of light to electricity in photovoltaics, or to energy-rich molecules (solar fuel) through photocatalytic processes, invariably starts with photoinduced generation of energy-rich electrons. The harvesting of these electrons in practical devices rests on a series of electron transfer processes whose dynamics and efficiencies determine the function of materials and devices. To capture the energy of a photogenerated electron-hole pair in a solar cell material, charges of opposite sign have to be separated against electrostatic attractions, prevented from recombining and being transported through the active material to electrodes where they can be extracted...
August 14, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28804699/all-inorganic-inverse-perovskite-solar-cells-using-zinc-oxide-nanocolloids-on-spin-coated-perovskite-layer
#6
Naoyuki Shibayama, Hiroyuki Kanda, Shin-Ichi Yusa, Shota Fukumoto, Ajay K Baranwal, Hiroshi Segawa, Tsutomu Miyasaka, Seigo Ito
We confirmed the influence of ZnO nanoparticle size and residual water on performance of all inorganic perovskite solar cells. By decreasing the size of the ZnO nanoparticles, the short-circuit current density (Jsc) and open circuit photovoltage (Voc) values are increased and the conversion efficiency is improved. Although the Voc value is not affected by the influence of residual water in the solution for preparing the ZnO layer, the Jsc value drops greatly. As a result, it was found that it is important to use the oxide nanoparticles with a small particle diameter and to reduce the water content in the oxide forming material in order to manufacture a highly efficient all inorganic perovskite solar cells...
2017: Nano Convergence
https://www.readbyqxmd.com/read/28801601/spray-cast-multilayer-perovskite-solar-cells-with-an-active-area-of-1-5%C3%A2-cm-2
#7
James E Bishop, David K Mohamad, Michael Wong-Stringer, Alex Smith, David G Lidzey
We utilise spray-coating under ambient conditions to sequentially deposit compact-TiO2, mesoporous-TiO2, CH3NH3PbI(3-x)Clx perovskite and doped spiro-OMeTAD layers, creating a mesoporous standard architecture perovskite solar cell (PSC). The devices created had an average power conversion efficiency (PCE) of 9.2% and a peak PCE of 10.2%; values that compare favourably with control-devices fabricated by spin-casting that had an average efficiency of 11.4%. We show that our process can be used to create devices having an active-area of 1...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28798418/enhanced-optical-absorption-via-cation-doping-hybrid-lead-iodine-perovskites
#8
Zhen-Kun Tang, Zhi-Feng Xu, Deng-Yu Zhang, Shu-Xian Hu, Woon-Ming Lau, Li-Min Liu
The suitable band structure is vital for perovskite solar cells, which greatly affect the high photoelectric conversion efficiency. Cation substitution is an effective approach to tune the electric structure, carrier concentration, and optical absorption of hybrid lead iodine perovskites. In this work, the electronic structures and optical properties of cation (Bi, Sn, and TI) doped tetragonal formamidinium lead iodine CH(NH2)2PbI3 (FAPbI3) are studied by first-principles calculations. For comparison, the cation-doped tetragonal methylammonium lead iodine CH3NH3PbI3 (MAPbI3) are also considered...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28798387/spiro-phenylpyrazole-fluorene-as-hole-transporting-material-for-perovskite-solar-cells
#9
Yang Wang, Tzu-Sen Su, Han-Yan Tsai, Tzu-Chien Wei, Yun Chi
Spiro-OMeTAD with symmetric spiro-bifluorene unit has dominated the investigation of hole-transporting material (HTM) for efficient perovskite solar cells (PSCs) despite of its low intrinsic hole conductivity and instability. In this study, we designed and synthesized three asymmetric spiro-phenylpyrazole/fluorene base HTMs, namely: WY-1, WY-2 and WY-3. They exhibit excellent electrochemical properties and hole conductivities. Moreover, the PSC based on WY-1 exhibits the highest power conversion efficiency (PCE) of 14...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28792724/atomic-layer-deposition-of-electron-selective-snox-and-zno-films-on-mixed-halide-perovskite-compatibility-and-performance
#10
Adam Hultqvist, Kerttu Aitola, Kári Sveinbjörnsson, Zahra Saki, Fredrik Larsson, Tobias Torndahl, Erik M J Johansson, Gerrit Boschloo, Marika Edoff
The compatibility of atomic layer deposition directly onto FAPBI3:MAPbBr3 perovskite films is investigated by exposing the perovskite films to the full or partial atomic layer deposition processes for the electron selective layer candidates ZnO and SnOx. Exposing the samples to the heat, the vacuum and even the counter reactant of H2O of the atomic layer deposition processes does not appear to alter the perovskite films in terms of crystallinity, but the choice of metal precursor is found to be critical. The Zn precursor Zn(C2H5)2 either by itself or in combination with H2O during the ZnO ALD process is found to enhance the decomposition of the bulk of the perovskite film into PbI2 without even forming ZnO...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792199/reduction-in-the-interfacial-trap-density-of-mechanochemically-synthesized-mapbi3
#11
Daniel Prochowicz, Pankaj Yadav, Michael Saliba, Marcin Saski, Shaik M Zakeeruddin, Janusz Lewiński, Michael Grätzel
Organo-lead halide perovskites have emerged as promising light harvesting materials for solar cells. The ability to prepare high quality films with a low concentration of defects is essential for obtaining high device performance. Here, we advance the procedure for the fabrication of efficient perovskite solar cells (PSCs) based on mechanochemically synthesized MAPbI3. The use of mechano-perovskite for the thin film formation provides a high degree of control of the stoichiometry and allows for the growth of relatively large crystalline grains...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792109/interface-engineering-of-perovskite-solar-cells-with-air-plasma-treatment-for-improved-performance
#12
Xiao Ma, Peng Tang, Dong Liu, Lili Wu, Jingquan Zhang, Lianghuan Feng
For high-efficiency perovskite solar cells (PSCs), interface engineering becomes critical for carrier collection from active perovskite material to the transport layer. To enhance power conversion efficiency (PCE), here we demonstrate a novel method named surface plasma treatment on mesoporous TiO2 electron transport layer (ETL) to improve electron extraction and transport properties at the perovskite/TiO2 interface. According to the XPS results, the plasma treatment induced a partial reduction of Ti4+ to Ti3+ within the TiO2 lattice and increased the concentration of oxygen vacancy on the TiO2 surface...
August 9, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28792059/solution-synthesis-and-phase-control-of-inorganic-perovskites-for-high-performance-optoelectronic-devices
#13
Jia Liang, Caixing Wang, Peiyang Zhao, Zhipeng Lu, Yue Ma, Zhaoran Xu, Yanrong Wang, Hongfei Zhu, Yi Hu, Guoyin Zhu, Lianbo Ma, Tao Chen, Zuoxiu Tie, Jie Liu, Zhong Jin
An efficient method to synthesize well-crystallized inorganic cesium lead halide perovskites (CsPbX3, X = I or Br) with high yield and high reproducibility was proposed. Notably, the as-prepared CsPbI3 in the yellow orthorhombic phase (y-CsPbI3) can be easily converted to the black cubic perovskite phase CsPbI3 (b-CsPbI3) after thermal annealing. Furthermore, two-terminal photodetectors and all-inorganic perovskite solar cells based on b-CsPbI3 were fabricated, exhibiting high performances.
August 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28783233/paintable-carbon-based-perovskite-solar-cells-with-engineered-perovskite-carbon-interface-using-carbon-nanotubes-dripping-method
#14
Jaehoon Ryu, Kisu Lee, Juyoung Yun, Haejun Yu, Jungsup Lee, Jyongsik Jang
Paintable carbon electrode-based perovskite solar cells (PSCs) are of particular interest due to their material and fabrication process costs, as well as their moisture stability. However, printing the carbon paste on the perovskite layer limits the quality of the interface between the perovskite layer and carbon electrode. Herein, an attempt to enhance the performance of the paintable carbon-based PSCs is made using a modified solvent dripping method that involves dripping of the carbon nanotubes (CNTs), which is dispersed in chlorobenzene solution...
August 7, 2017: Small
https://www.readbyqxmd.com/read/28782965/nanoscale-back-contact-perovskite-solar-cell-design-for-improved-tandem-efficiency
#15
Gede W P Adhyaksa, Eric Johlin, Erik C Garnett
Tandem photovoltaics, combining absorber layers with two distinct band gap energies into a single device, provide a practical solution to reduce thermalization losses in solar energy conversion. Traditionally, tandem devices have been assembled using two-terminal (2-T) or four-terminal (4-T) configurations; the 2-T limits the tandem performance due to the series connection requiring current matching, while the standard 4-T configuration requires at least three transparent electrical contacts, which reduce the total collected power due to unavoidable parasitic absorption...
August 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28782016/light-induced-picosecond-rotational-disordering-of-the-inorganic-sublattice-in-hybrid-perovskites
#16
Xiaoxi Wu, Liang Z Tan, Xiaozhe Shen, Te Hu, Kiyoshi Miyata, M Tuan Trinh, Renkai Li, Ryan Coffee, Shi Liu, David A Egger, Igor Makasyuk, Qiang Zheng, Alan Fry, Joseph S Robinson, Matthew D Smith, Burak Guzelturk, Hemamala I Karunadasa, Xijie Wang, Xiaoyang Zhu, Leeor Kronik, Andrew M Rappe, Aaron M Lindenberg
Femtosecond resolution electron scattering techniques are applied to resolve the first atomic-scale steps following absorption of a photon in the prototypical hybrid perovskite methylammonium lead iodide. Following above-gap photoexcitation, we directly resolve the transfer of energy from hot carriers to the lattice by recording changes in the mean square atomic displacements on 10-ps time scales. Measurements of the time-dependent pair distribution function show an unexpected broadening of the iodine-iodine correlation function while preserving the Pb-I distance...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28773874/annealing-effect-on-fapbi%C3%A2-1-x-mapbbr%C3%A2-x-perovskite-films-in-inverted-type-perovskite-solar-cells
#17
Lung-Chien Chen, Jia-Ren Wu, Zhong-Liang Tseng, Cheng-Chiang Chen, Sheng Hsiung Chang, Jun-Kai Huang, King-Lien Lee, Hsin-Ming Cheng
This study determines the effects of annealing treatment on the structure and the optical and electronic behaviors of the mixed (FAPbI₃)1-x(MAPbBr₃)x perovskite system. The experimental results reveal that (FAPbI₃)1-x(MAPbBr₃)x (x ~ 0.2) is an effective light-absorbing material for use in inverted planar perovskite solar cells owing to its large absorbance and tunable band gap. Therefore, good band-matching between the (FAPbI₃)1-x(MAPbBr₃)x and C60 in photovoltaic devices can be controlled by annealing at various temperatures...
September 3, 2016: Materials
https://www.readbyqxmd.com/read/28773199/effects-of-annealing-conditions-on-mixed-lead-halide-perovskite-solar-cells-and-their-thermal-stability-investigation
#18
Haifeng Yang, Jincheng Zhang, Chunfu Zhang, Jingjing Chang, Zhenhua Lin, Dazheng Chen, He Xi, Yue Hao
In this work, efficient mixed organic cation and mixed halide (MA0.7FA0.3Pb(I0.9Br0.1)₃) perovskite solar cells are demonstrated by optimizing annealing conditions. AFM, XRD and PL measurements show that there is a better perovskite film quality for the annealing condition at 100 °C for 30 min. The corresponding device exhibits an optimized PCE of 16.76% with VOC of 1.02 V, JSC of 21.55 mA/cm² and FF of 76.27%. More importantly, the mixed lead halide perovskite MA0.7FA0.3Pb(I0.9Br0.1)₃ can significantly increase the thermal stability of perovskite film...
July 21, 2017: Materials
https://www.readbyqxmd.com/read/28770935/insights-into-charge-carrier-dynamics-in-organo-metal-halide-perovskites-from-neat-films-to-solar-cells
#19
Jiajun Peng, Yani Chen, Kaibo Zheng, Tõnu Pullerits, Ziqi Liang
Organo-metal halide perovskites have recently obtained world-wide attention as promising solar cell materials. They have broad and strong light absorption along with excellent carrier transport properties which partially explain their record power conversion efficiencies above 22%. However, the basic understanding of the underlying physical mechanisms is still limited and there remain large discrepancies among reported transport characteristics of perovskite materials. Notably, the carrier mobility of perovskite samples either in thin films or within solar cells obtained using different techniques can vary by up to 7-8 orders of magnitude...
August 3, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28770605/molecular-engineering-of-simple-benzene-arylamine-hole-transporting-materials-for-perovskite-solar-cells
#20
Xuepeng Liu, Fantai Kong, Shengli Jin, Wangchao Chen, Ting Yu, Tasawar Hayat, Ahmed Alsaedi, Hongxia Wang, Zhan'ao Tan, Jian Chen, Songyuan Dai
Three benzene-arylamine hole transporting materials with different number of terminal groups were prepared. It is noted that that the molecule with three arms (H-Tri) shows lower HOMO level and better film morphology on perovskite layer than the molecules with two or four arms (H-Di, H-Tetra). When these molecules were applied to perovskite solar cells, H-Tri-based one shows better performance compared to H-Di- or H-Tetra-based one. Photoluminescence and impedance spectroscopy study demonstrate that H-Tri can improve hole-electron separation efficiency and decrease charge recombination, thus leading to better performance...
August 3, 2017: ACS Applied Materials & Interfaces
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