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Subhendu Guha | |
|---|---|
| Born | 1942 (age 81–82) |
| Nationality | Indian |
| Citizenship | American |
| Alma mater | Calcutta University: TIFR, India; University of Sheffield, United Solar, MI, USA |
| Occupation(s) | Semiconductor, photovoltaics, solar architecture |
| Known for | Invention of high quality amorphous silicon |
Subhendu Guha (born 1942 in Dhaka) is an Indian scientist in the field of photovoltaics. [1] [2]
Subhendu Guha was born in 1942 in Dhaka. Subhendu studied at Presidency College, Kolkata, and obtained his M.Tech. and PhD from the University of Calcutta. [3]
Subhendu developed a new process for making Amorphous silicon in 1979 after he joined Tata Institute of Fundamental Research, Mumbai in 1968. [4]
In 1991, he led a team of scientists at United Solar that made innovations to achieve efficiency solar cells and modules using Thin-film solar cell silicon and also the invention of flexible solar roofing shingles.[ citation needed ]
In 2006, when Subhendu was President of United Solar, he discussed solar technology with former President George W. Bush during the president's visit to United Solar. [5] [6] He has also served as a panelist on the US Senate committee on energy and natural resources. [7]
Subhendu is a recipient of the Bright Light Award from the US Department of Energy, [8] and the PVSEC 2009 award for outstanding contribution to science and technology of photovoltaic. [9]
He also received the World Technology Award [1] and the Best of the Best Award from ABP Ananda for his contribution to science. [10]
In the 19th century, it was observed that the sunlight striking certain materials generates detectable electric current – the photoelectric effect. This discovery laid the foundation for solar cells. Solar cells have gone on to be used in many applications. They have historically been used in situations where electrical power from the grid was unavailable.
A solar cell or photovoltaic cell is an electronic device that converts the energy of light directly into electricity by means of the photovoltaic effect. It is a form of photoelectric cell, a device whose electrical characteristics vary when it is exposed to light. Individual solar cell devices are often the electrical building blocks of photovoltaic modules, known colloquially as "solar panels". Almost all commercial PV cells consist of crystalline silicon, with a market share of 95%. Cadmium telluride thin-film solar cells account for the remainder. The common single-junction silicon solar cell can produce a maximum open-circuit voltage of approximately 0.5 to 0.6 volts.
A solar panel is a device that converts sunlight into electricity by using photovoltaic (PV) cells. PV cells are made of materials that produce excited electrons when exposed to light. The electrons flow through a circuit and produce direct current (DC) electricity, which can be used to power various devices or be stored in batteries. Solar panels are also known as solar cell panels, solar electric panels, or PV modules.
Third-generation photovoltaic cells are solar cells that are potentially able to overcome the Shockley–Queisser limit of 31–41% power efficiency for single bandgap solar cells. This includes a range of alternatives to cells made of semiconducting p-n junctions and thin film cells. Common third-generation systems include multi-layer ("tandem") cells made of amorphous silicon or gallium arsenide, while more theoretical developments include frequency conversion,, hot-carrier effects and other multiple-carrier ejection techniques.
MiaSolé is an American solar energy company selling copper indium gallium selenide (CIGS) thin-film photovoltaic products. MiaSolé's manufacturing process lays CIGS on a flexible stainless steel substrate. MiaSolé produces all layers of photovoltaic material in a continuous sputtering process.
Global Solar Energy is a US-based manufacturer of CIGS solar cells, a thin-film based photovoltaic technology, with manufacturing operations in Tucson, Arizona, United States, and Berlin, Germany. In 2013, it was bought by Chinese renewable energy company Hanergy.
Monocrystalline silicon, often referred to as single-crystal silicon or simply mono-Si, is a critical material widely used in modern electronics and photovoltaics. As the foundation for silicon-based discrete components and integrated circuits, it plays a vital role in virtually all modern electronic equipment, from computers to smartphones. Additionally, mono-Si serves as a highly efficient light-absorbing material for the production of solar cells, making it indispensable in the renewable energy sector.
TEL Solar, formerly Oerlikon Solar, is a manufacturer of production equipment for the manufacturing of thin-film silicon cells, headquartered in Trübbach, Switzerland, near the border to Liechtenstein. The Japanese electronics and semiconductor company Tokyo Electron acquired the company of about 650 employees from OC Oerlikon in November 2012.
Thin-film solar cells are a type of solar cell made by depositing one or more thin layers of photovoltaic material onto a substrate, such as glass, plastic or metal. Thin-film solar cells are typically a few nanometers (nm) to a few microns (μm) thick–much thinner than the wafers used in conventional crystalline silicon (c-Si) based solar cells, which can be up to 200 μm thick. Thin-film solar cells are commercially used in several technologies, including cadmium telluride (CdTe), copper indium gallium diselenide (CIGS), and amorphous thin-film silicon.
Crystalline silicon or (c-Si) is the crystalline forms of silicon, either polycrystalline silicon, or monocrystalline silicon. Crystalline silicon is the dominant semiconducting material used in photovoltaic technology for the production of solar cells. These cells are assembled into solar panels as part of a photovoltaic system to generate solar power from sunlight.
PowerFilm, Inc. is a manufacturer of flexible thin film solar photovoltaic (PV) modules, or solar panels, based in Ames, Iowa and is a provider of solar products for industrial, consumer and military remote power applications. PowerFilm's amorphous silicon (a-Si) thin-film solar modules are both built into solar charger products as well as sold to OEM integrators.
There are currently many research groups active in the field of photovoltaics in universities and research institutions around the world. This research can be categorized into three areas: making current technology solar cells cheaper and/or more efficient to effectively compete with other energy sources; developing new technologies based on new solar cell architectural designs; and developing new materials to serve as more efficient energy converters from light energy into electric current or light absorbers and charge carriers.
Solar-cell efficiency is the portion of energy in the form of sunlight that can be converted via photovoltaics into electricity by the solar cell.
Polycrystalline silicon, or multicrystalline silicon, also called polysilicon, poly-Si, or mc-Si, is a high purity, polycrystalline form of silicon, used as a raw material by the solar photovoltaic and electronics industry.
Amorphous silicon (a-Si) is the non-crystalline form of silicon used for solar cells and thin-film transistors in LCDs.
At the time of commissioning in 2003, the 500 kW Chevron Solarmine solar photovoltaic (PV) system was the world's largest thin-film amorphous silicon solar PV system and one of the largest solar PV systems in the United States. Located at the Midway-Sunset Oil Field, Solarmine was the first solar PV system in California to power oil field operations.
Nam-Gyu Park is Distinguished Professor and Sungkyunkwan University (SKKU)-Fellow at School of Chemical Engineering, SKKU. His research focuses on high efficiency mesoscopic nanostructured solar cells.
David E. Carlson was an American physicist who invented thin film, amorphous silicon based, photovoltaic solar cells.
Heterojunction solar cells (HJT), variously known as Silicon heterojunctions (SHJ) or Heterojunction with Intrinsic Thin Layer (HIT), are a family of photovoltaic cell technologies based on a heterojunction formed between semiconductors with dissimilar band gaps. They are a hybrid technology, combining aspects of conventional crystalline solar cells with thin-film solar cells.