Gadgets
IIT Kanpur scientists use inkjet printers to ‘print’ organic solar cells
[vc_row][vc_column][vc_column_text]By Namrata Dave
Researchers at the Indian Institute of Technology, Kanpur have used technique of inkjet printing to print thin nickel oxide films to make organic solar cells.
Organic solar cells contain carbon-based and light-absorbing materials that can convert solar energy to electricity. When a photon of light falls on an organic solar cell, its energy is absorbed by an electron of the light-absorbing material. With this energy, the electron is able to jump to a higher energy state. Due to this jump, a ‘hole’ is left back in the place where the electron earlier was. However, strong forces of attraction bind the electron and hole together, and current can only flow through the cell if the negatively charged electron and positively charged hole are separated and directed to different electrodes. This separation is achieved by an electron transporting layer and a hole transporting layer respectively. These layers are very thin films of compounds which are deposited on either side of the light absorbing material.
components of an organic solar cell
Nickel Oxide (NiO) demonstrates properties that are ideal for use as a hole transporting layer, but previous studies have shown that it has been a challenge to prepare thin NiO films on a large scale.
In their study, published in journal Scientific Reports, researchers from IIT Kanpur have attempted to overcome this roadblock by using the technique of inkjet printing. In inkjet printing of NiO films, the ‘ink’ is NiO and the ‘paper’ is a substrate of glass coated with a material that serves as the positive electrode. By testing various experimental conditions, the researchers were able to prepare uniform, smooth NiO films as thin as 18 nanometres by using NiO ink having drops of a specific size, and by providing the substrate with a UV-Ozone treatment prior to printing.
It is important for the hole transporting layer to be as transparent as possible to ensure that maximum light goes through to the light absorbing material. The researchers found that the inkjet-printed NiO film showed different degrees of transparency at different temperatures, and was able to transmit a maximum of 89% of the light falling on it, by thermally treating the film at 400 ºC.
The next part of this study was to test the performance of this inkjet-printed NiO film in an organic solar cell device. In such a device,the hole transporting layer must bond well with the light absorbing material to provide a smooth passage for the positively charged ‘holes’ of the material to reach an electrode. For this, they chemically and thermally treated the NiO film, and were able to drastically improve the conversion efficiency of the device from 0.75% to 2.67%.
NiO films can also be prepared by another technique known as ‘spin coating’, but this technique is not suitable for large scale production and a lot of raw material is wasted. This study shows that structurally and chemically identical NiO films can be easily manufactured on a large scale at a low cost by using the technique of inkjet printing.
This research team included Arjun Singh, Shailendra Kumar Gupta and Ashish Garg from Department of Materials Science and Engineering at the Indian Institute of Technology, Kanpur. (India Science Wire)[/vc_column_text][/vc_column][/vc_row]
Gadgets
OnePlus to launch Nord CE 3 in India, specs and price leaked ahead of global debut
OnePlus may soon expand its affordable smartphone series Nord CE. It is being claimed that the company is going to launch the new OnePlus Nord CE 3 in July this year. As per the leaks, the OnePlus Nord CE 3 will be introduced as a successor to the OnePlus Nord CE 2.
OnePlus may soon expand its affordable smartphone series Nord CE. It is being claimed that the company is going to launch the new OnePlus Nord CE 3 in July this year. As per the leaks, the OnePlus Nord CE 3 will be introduced as a successor to the OnePlus Nord CE 2. The information about the phone has also been revealed ahead of its official debut on many digital platforms. However, the company has not yet given any information regarding the same as yet.
According to a report by My Smart Price, the OnePlus Nord CE 3 is expected to launch in July alongside of OnePlus Nord 3. The tipster also has claimed about the specification of the phone as well. Scroll down to know more about the smartphone.
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According to tipster Steve Hemmerstoffer (@OnLeaks), the OnePlus CE 3 will come with a display with 120Hz refresh rate, under which the user will be able to have a high definition display quality while playing videos. The handset is also likely to feature a 6.72 inch Full HD Plus AMOLED display. Earlier it was being said that this phone will be introduced with an IPS LCD screen. However, the confirmation is still awaited.
Leaks also suggested that the OnePlus Nord CE 3 is expected to be powered by the octa-core Snapdragon 782G processor coupled with up to 12GB of RAM and up to 256GB of inbuilt storage. The upcoming OnePlus Nord CE 3 could be equipped with three rear cameras. The phone can get a 50-megapixel Sony IMX890 primary sensor, an 8-megapixel ultra-wide-angle lens, and a 2-megapixel macro lens. The phone is expected to get a 16-megapixel sensor for selfie and video calls.
The handset is said to have an in-display fingerprint sensor, a 5000mAh battery with 80W fast charging support, dual-band Wi-Fi, 5G, 4G LTE, Bluetooth and a USB Type-C port.
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Gadgets
Vivo launches color-changing back panel smartphone V27 Pro in India, check price and specs
The Chinese smartphone manufacturer Vivo has launched its awaited color-changing back panel smartphone V27 Pro in India, along with the lower variant V27. Interested customers can purchase the handset in magic blue and noble black color
The Chinese smartphone manufacturer Vivo has launched its awaited color-changing back panel smartphone V27 Pro in India, along with the lower variant V27. Interested customers can purchase the handset in magic blue and noble black color. Pre-booking of Vivo V27 Pro has started and sales will be from March 6. The sale of Vivo V27 will start from 23 March.
As per the official details, the handset is the upgraded version of the Vivo V25 series, which was launched last year. The company has introduced the Vivo V27 Series with Android 13-based Funtouch OS 13 and MediaTek processor, under which customers will be able to access heavy applications without and lag.
Know everything about the Vivo’s Vivo V27 and V27 Pro
As per the photos shared by the company, Vivo V27 Pro and Vivo V27 come with a 3D curved screen with a refresh rate of 120Hz that offers users to have a high-definition screen experience while playing any video. It comes with a glass panel that changes color whenever some light or sun rays strike it. Both Vivo V27 Pro and Vivo V27 phones have three rear cameras, and features. The Vivo V27 Pro has a MediaTek Dimensity 8200 processor, while Vivo V27 has Dimensity 7200 5G processor. Both the chipset have been considered the advance chipset in the Indian market.
Price of Vivo’s V27 and V27 Pro
The price of 128 GB storage with 8 GB RAM of Vivo V27 Pro is Rs 37,999. At the same time, the price of 256 GB storage with 8 GB RAM has been kept at Rs 39,999. The 256 GB storage variant with the phone’s 12 GB RAM is priced at Rs 42,999. The price of 128 GB storage with 8 GB RAM of Vivo V27 has been priced at Rs 32,999 and 256 GB storage with 12 GB RAM has been priced at Rs 36,999.
The leading smartphone manufacturer Samsung recently launched the Galaxy S23 series in India, since then, the handsets became the talk of the time. Now the company is all set to attract more customers as it has decided to launch an affordable variant of Samsung Galaxy S23 FE in the country.
Ahead of the official launch, many information such as specs, design leaked on digital platforms, claiming the handset might come with the latest processor with a 120 Hz AMOLE display that will allow users to have a high-definition experience while playing videos or using the phone. As per the leaks, the phone could be equipped with a flagship chipset launched by Qualcomm last year. However, the South Korean tech giant hasn’t revealed anything regarding the same as of now. Not even the price and launch date.
Once launched, interested customers can purchase the smartphone from the company’s authorized store. If one wants it at an additional discount, they can purchase the phone from the e-commerce giant Amazon or Flipkart.
Know everything about Samsung Galaxy S21 FE
Tipster Connor (@OreXda) claims that the Samsung Galaxy S23 FE will be powered by the Snapdragon 8+ Gen 1 processor. It is the second most powerful chipset from Qualcomm after Snapdragon 8 Gen 2. A lot of flagship phones of this year shared the with same Snapdragon 8 Gen 1 such as OnePlus 11R, Xiaomi 12S Ultra, Asus Zenfone 9, Samsung Galaxy Z Flip 4, and Oppo Find N2 among others.
It said that the upcoming Samsung Galaxy S21 FE might replace the company’s feature-loaded smartphone Galaxy A74. It is expected that the company likely to launch the S21 FE at a similar price as A74.
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