A long time ago I wrote about a research team who thought they could power an entire house using nothing more than a solar panel the size of a book, and since then we’ve seen the development of new solar panels and concentrators that exceed 130% energy efficiency and that work in all weather conditions and at night. And now, in yet another boost to all things solar powered Stanford engineers have developed a pyramid-shaped lens that can focus sunlight from any angle onto a solar cell, keeping it collecting even more glorious power from sunrise to sunset.
Solar cells work best in direct sunlight, which means many of them might only have a few good hours of energy generation in them per day. Others maximize their working time by actively moving to follow the Sun across the sky, but that consumes energy and adds mechanical complexity.
The Future of Energy keynote, by speaker Matthew Griffin
For the new study, the Stanford team set out to develop a passive technology that can collect sunlight that strikes it from any angle, and concentrates it towards the solar cell beneath. The end result is an array of inverted-pyramid-shaped structures that the team calls Axially Graded Index Lenses (AGILE), which would form a layer that replaces the protective top surface of a solar cell.
In tests, the AGILE prototypes were able to capture more than 90 percent of the light that hit its surface, focusing it so that it’s three times brighter by the time it reaches the solar cell. The team says that this system could improve the efficiency of solar cells by allowing them to collecting even more ambient and indirect sunlight, as well as boosting their output in less than ideal weather and conditions.
AGILE sounds simple enough, but the engineering behind it is quite complicated. Each little pyramid is made up of a stack of different glasses and polymers with different refractive indices – essentially, each layer bends the incoming light to a different degree. The top layer has a low refractive index to allow the light to enter from any angle, but each step down bends it a little more, until it focuses on the solar cell below. The sides are mirrored to bounce any wayward light back where it needs to go.
The new lens
These multiple materials also allow the device to capture a wide spectrum of light, from near-ultraviolet to infrared. The team also had to make sure the materials worked well together – for instance, that they expand in heat at similar rates so as not to crack the device. Even using several materials, the team demonstrated that AGILE can be 3D printed.
The team says that the new system could help expand the places where solar energy can be used, reducing both the cost and the land needed. AGILE could even improve solar cells for spacecraft.
Matthew Griffin, described as “The Adviser behind the Advisers” and a “Young Kurzweil,” is the founder and CEO of the World Futures Forum and the 311 Institute, a global Futures and Deep Futures consultancy working between the dates of 2020 to 2070, and is an award winning futurist, and author of “Codex of the Future” series.
Regularly featured in the global media, including AP, BBC, Bloomberg, CNBC, Discovery, RT, Viacom, and WIRED, Matthew’s ability to identify, track, and explain the impacts of hundreds of revolutionary emerging technologies on global culture, industry and society, is unparalleled. Recognised for the past six years as one of the world’s foremost futurists, innovation and strategy experts Matthew is an international speaker who helps governments, investors, multi-nationals and regulators around the world envision, build and lead an inclusive, sustainable future.
A rare talent Matthew’s recent work includes mentoring Lunar XPrize teams, re-envisioning global education and training with the G20, and helping the world’s largest organisations envision and ideate the future of their products and services, industries, and countries.
Matthew's clients include three Prime Ministers and several governments, including the G7, Accenture, Aon, Bain & Co, BCG, Credit Suisse, Dell EMC, Dentons, Deloitte, E&Y, GEMS, Huawei, JPMorgan Chase, KPMG, Lego, McKinsey, PWC, Qualcomm, SAP, Samsung, Sopra Steria, T-Mobile, and many more.
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