The evolution of photovoltaic solar energy from Alexandre Becquerel's 1839 discovery of the photovoltaic effect to modern perovskite tandem cells, encompassing key milestones in silicon solar cells, space applications, and global manufacturing.
Alexandre-Edmond Becquerel observes the photovoltaic effect while experimenting with an electrolytic cell, laying the foundation for solar energy. #science #history
Willoughby Smith finds that selenium's electrical conductivity increases with light exposure, a key step toward photovoltaics. #science
Charles Fritts builds the first solar cell using selenium coated with a thin layer of gold, achieving about 1% efficiency. #invention
Albert Einstein publishes his paper on the photoelectric effect, providing the theoretical basis for converting light into electricity. #science #physics
Robert Millikan experimentally confirms Einstein's photoelectric effect equations, solidifying the quantum theory of light. #science
Daryl Chapin, Calvin Fuller, and Gerald Pearson create the first practical silicon solar cell at Bell Labs, achieving 6% efficiency. #technology #invention
Vanguard 1, the first solar-powered satellite, launches with six silicon solar cells, demonstrating space applications. #space #technology
Sharp Corporation begins mass-producing silicon solar cells for lighthouses and remote power, marking early commercialization. #business #technology
Zhores Alferov and team create the first gallium arsenide (GaAs) heterojunction solar cell, achieving higher efficiency than silicon. #science
The 1973 oil crisis leads to increased government funding for solar energy research worldwide. #energy #history
Carlson and Wronski at RCA develop the first amorphous silicon thin-film solar cell, enabling flexible and low-cost panels. #technology
Researchers at the University of New South Wales achieve 20% efficiency in a silicon solar cell, a major milestone. #science
Boeing and Spectrolab develop a multijunction solar cell with over 30% efficiency for space applications. #technology #space
Michael Grätzel and Brian O'Regan invent the dye-sensitized solar cell (DSSC), a low-cost alternative to silicon. #science #invention
Global cumulative installed solar PV capacity reaches 1 gigawatt, driven by Japan and Germany. #energy
Germany enacts the Renewable Energy Sources Act, providing feed-in tariffs that boost solar adoption worldwide. #policy #energy
Chinese companies like Suntech Power and Yingli Solar begin large-scale production, driving down costs. #business #manufacturing
Spectrolab achieves 40.7% efficiency in a concentrator multijunction solar cell. #technology
Cumulative installed solar PV capacity reaches 10 GW, with Spain and Germany leading installations. #energy
Tsutomu Miyasaka and colleagues create the first perovskite solar cell with 3.8% efficiency, sparking a new research field. #science #invention
The cost of solar PV modules falls below $1 per watt for the first time, making solar competitive. #economics #energy
After the Fukushima nuclear accident, Japan introduces generous feed-in tariffs, rapidly expanding solar capacity. #energy #policy
Perovskite solar cell efficiency surpasses 10%, attracting global research interest. #science
China installs more solar PV than any other country, driven by government targets and manufacturing scale. #energy #china
Companies like Oxford PV begin pilot production of perovskite solar modules. #business #technology
Global solar PV additions exceed coal for the first time, signaling a shift in energy investment. #energy #climate
Perovskite solar cells achieve 22.1% efficiency, rivaling silicon. #science
Oversupply of Chinese silicon wafers drives prices down by over 50%, accelerating solar adoption. #economics #manufacturing
Oxford PV achieves 25.2% efficiency in a perovskite-silicon tandem cell. #technology
Cumulative installed solar PV capacity surpasses 600 GW, with China, US, and Japan leading. #energy
Solar PV becomes the cheapest source of electricity in many regions, with LCOE below $0.03/kWh. #economics #energy
Researchers achieve 29.5% efficiency in a perovskite-silicon tandem cell, nearing theoretical limits. #science
Worldwide installed solar PV capacity reaches 1 terawatt, a milestone for renewable energy. #energy
LONGi Green Energy sets a new record for perovskite-silicon tandem cell efficiency at 33.7%. #technology
Oxford PV begins shipping commercial perovskite-silicon tandem modules for utility-scale projects. #business #energy