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Materials scientists at the UCLA Samueli School of Engineering and colleagues from five other universities around the world have discovered the major reason why perovskite solar cells—which show great promise for improved energy-conversion efficiency—degrade in sunlight, causing their performance to suffer over time. The team successfully demonstrated a simple manufacturing adjustment to fix the cause of the degradation, clearing the biggest hurdle toward the widespread adoption of the thin-film solar cell technology.

A research paper detailing the findings was published today in Nature. The research is led by Yang Yang, a UCLA Samueli professor of materials science and engineering and holder of the Carol and Lawrence E. Tannas, Jr., Endowed Chair. The co-first authors are Shaun Tan and Tianyi Huang, both recent UCLA Samueli Ph.D. graduates whom Yang advised.

Perovskites are a group of materials that have the same atomic arrangement or crystal structure as the mineral calcium titanium oxide. A subgroup of perovskites, metal halide perovskites, are of great research interest because of their promising application for energy-efficient, thin-film solar cells.

The fix could pave the way for commercialization of the high-performance, sunlight-to-electricity discovery.

In the future, decarbonized societies that use internet of things (IoT) devices will become commonplace. But to achieve this, we need to first realize highly efficient and stable sources of renewable energy. Solar cells are considered a promising option, but their electrical contacts suffer from a “tradeoff” relationship between surface passivation and conductivity. Recently, researchers from Japan have developed a new type of electrical contact that can overcome this problem.

The most recent type of commercial photovoltaic cell (solar cell) uses stacked layers of crystalline silicon (c-Si) and an ultrathin layer of silicon oxide (SiO_x) to form an electrical contact. The SiO_x is used as a “passivating” film—an unreactive layer that improves the performance, reliability, and stability of the device. But that does not mean that simply increasing the thickness of this passivating layer will lead to improved solar cells. SiO_x is an electrical insulator and there is a trade-off relationship between passivation and the conductivity of the electrical contact in solar cells.

In a new study, published in ACS Applied Nano Materials, a research team led by Assistant Professor Kazuhiro Gotoh and Professor Noritaka Usami from Nagoya University has developed a novel SiO_x layer that simultaneously allows high passivation and improved conductivity. Named NAnocrystalling Transport path in Ultrathin dielectrics for REinforcing passivating contact (NATURE contact), the new electrical contact consists of three-layer structures made up of a layer of silicon nanoparticles sandwiched between two layers of oxygen-rich SiO_x. “You can think of a passivating film as a big wall with gates in it. In the NATURE contact, the big wall is the SiO_x layer and the gates are Si nanocrystals,” explains Dr. Gotoh.

US startup company Green Hydrogen International announced plans for a a 60GW renewable H₂ project that will be powered by wind and solar. It’ll also produce clean rocket fuel for SpaceX, which is helmed by billionaire Tesla CEO Elon Musk, according to a report published yesterday in Recharge.

“We see Hydrogen City becoming one of the largest H₂ production centers in the world, supplying many different customers with 100% clean H₂ fuel,” founder Brian Maxwell told the energy industry pub.

The image below from GHI’s website shows the process of converting renewable energy from wind and solar farms into ammonia and rocket fuel. The key to scaling up production, the company says, is the large salt storage capability found in underground salt domes.

Engineering projects need goals, and James Worden ’89 set an especially engaging and enduring one for himself as a high school student in the early 1980s while pursuing his passion for homebuilt go-karts.

The MIT Alumni Association seeks to engage and inspire the MIT global community to make a better world. It provides a lifelong community for MIT graduates, a launching pad for students, and growing connection among MIT friends.

Circa 2020

The short-term prospects for wind and solar power look rocky amid the economic upheaval of the coronavirus. But long term, renewables could emerge stronger than ever, especially if governments integrate support for clean energy into Covid-19 economic-recovery programs.

To maintain peak efficiency, solar cells must be regularly cleaned of dust and other accumulated dirt. However, many panels are installed in high or hard-to-reach locations, which makes cleaning them difficult, time-consuming, and also simply dangerous. One solution is to use aerial drones to spray soapy water on dirty solar panels. However, these drones often run out of battery quite quickly. In addition, they also do not make direct contact with the panels, so they may not completely wash away dirt.

To solve these problems, a Belgian startup, ART Robotics, has developed HELIOS, an automated cleaning service for solar panels. It’s a fully autonomous system that can access difficult-to-reach places and eliminates dangerous and costly work.

Continue reading “Meet HELIOS, an automated solar panel cleaning system” »

Dutch firm MVRDV has launched the first look at its upcoming “Sun Rock” project in Taiwan, an environmentally conscious and design-minded power supply building. Anticipating Taiwan’s planned transition to green energy, the features of the Sun Rock building, from its shape to its façade, are focused on generating solar energy as efficiently as possible.

Located at the Changhua Coastal Industrial Park, near Taichung, the building’s primary purpose is to store and maintain suitable energy equipment. The building is almost totally covered with solar panels, capable of generating roughly 1 million kWh of green energy every year.

The site for Taipower’s new facility receives a significant amount of solar exposure throughout the year, and so the rounded shape of Sun Rock is designed to maximize how much of that sunlight can be harnessed for energy. The building slopes gently downwards on the southern side, creating a large surface area that directly faces the sun during the middle of the day. At the northern end, on the other hand, the dome shape is intended to maximize the area of the building exposed to the sun in the mornings and evenings.