The Origin Story: How Solar Energy Was Invented
Solar technology has a rich history originating in the West. In 1881, American inventor Charles Fritts built the world’s first commercial solar panel array, reporting that its energy production was “continuous, constant, and of considerable force—not only under direct sunlight, but also in dim, diffused daylight.”
Decades later, in 1939, Russell Ohl developed the foundational silicon solar cell design that underpins modern photovoltaic technology, securing a patent in 1941. By 1954, Bell Labs built upon this design to create the world’s first commercially viable silicon solar cell.
Decades later, in 1939, Russell Ohl developed the foundational silicon solar cell design that underpins modern photovoltaic technology, securing a patent in 1941. By 1954, Bell Labs built upon this design to create the world’s first commercially viable silicon solar cell.
Why Did Solar Play a Minor Role for Over a Century?
Despite being a clean, abundant, and endless energy source, solar adoption remained slow for nearly 100 years due to two primary obstacles:
- Prohibitive Capital Costs: Environmental benefits alone were not enough to drive global adoption as long as manufacturing remained expensive. Before 2016, high production costs limited solar installations primarily to scientific research, specialized industrial applications, or remote off-grid setups.
- Intermittent Energy Generation: Solar power relies on daylight and seasonal sunlight patterns, leading to production drops during winters and cloudy weather, and zero production at night.
What Caused the Rapid Global Surge in Solar Adoption?
In recent years, three major factors transformed solar energy from a niche technology into a dominant global power source:
- Unprecedented Cost Parity: Thanks to aggressive industrial scale-up, solar electricity costs plummeted by over 80% between 2010 and 2020, making solar generation significantly cheaper than traditional utility grid electricity in most countries.
- Advances in Energy Storage: The commercial maturation of lithium batteries solved solar energy’s intermittency problem. Battery storage allows homes and businesses to store daytime excess power for nighttime use, with 5 kWh home storage units becoming widely accessible across Europe.
- Rising Utility Costs & Grid Volatility: Geopolitical instability and rising fossil fuel prices pushed utility rates to record highs. Solar power, paired with reliable hybrid inverters, emerged as the most effective hedge against skyrocketing electricity bills.
How Manufacturing Innovation Scaled Photovoltaics
The rapid decline in global solar costs was driven by major technological and manufacturing breakthroughs:
1. The RCZ Monocrystalline Breakthrough
In 2014, LONGi overcame the industrialization challenges of Re-chargeable Czochralski (RCZ) monocrystalline ingot growth, expanding single-crucible yield from 60 kg to over 1,500 kg. This increased pulling speeds by over 80% and closed the cost gap between monocrystalline silicon and lower-efficiency polycrystalline options. In 2020 alone, this manufacturing shift saved the solar industry an estimated 13.6 billion RMB in production costs.
2. Diamond Wire Slicing Technology
Around the same time, the industrialization of diamond wire wafer cutting broke overseas manufacturing monopolies. By localizing production and scaling supply, diamond wire costs dropped to ~0.3 RMB per meter, cutting annual sector costs by approximately 30 billion RMB and paving the way for high-efficiency monocrystalline dominance.
3. Overcoming PERC Light-Induced Degradation (LID)
While Passivated Emitter and Rear Cell (PERC) technology promised higher efficiency, early iterations suffered from severe Light-Induced Degradation (LID). Collaborating with global research institutions like the University of New South Wales, industry engineers successfully solved the LID mechanism in monocrystalline PERC cells and shared the solution across the supply chain.
The Result: Grid Parity and Mass Adoption
Unlocking PERC technology enabled continuous innovations—such as bifacial modules, half-cut cells, multi-busbar (MBB) layouts, and shingled cell architecture—which steadily pushed module efficiency higher while driving unit costs down.
By late 2017, high-efficiency monocrystalline modules achieved price parity with older polycrystalline panels, triggering a rapid market transition. Ultimately, these continuous manufacturing iterations slashed overall photovoltaic costs by nearly 80% over a single decade, making clean, integrated solar energy solutions accessible worldwide.