Sharp solar cells refresh the world's highest conversion efficiency

July 27, 2025

In a significant breakthrough, Sharp has developed a high-efficiency solar cell that features three layers of light-absorbing materials, achieving the world's highest conversion efficiency. By carefully adjusting the composition ratio of the bottom layer, the company has enhanced the cell's ability to capture sunlight, leading to improved performance. This achievement was verified by AIST (Japan Institute of Industrial Technology), one of the leading global institutions for solar cell testing, which confirmed a conversion efficiency of 37.9% on a cell area of about 1 square centimeter. The new solar cell is called "Compound 3-Junction" and was part of NEDO's (New Energy and Industrial Technology Development Organization) research initiative on innovative photovoltaic technology. In the category of non-concentrating solar cells at the laboratory level, this 37.9% efficiency marks a new global record. Previously, the same type of solar cell reached 35.8% in 2009, 36.9% in 2011, and 37.7% in 2012. This latest result sets a new benchmark. The compound solar cell uses a light-absorbing layer composed of a compound made from multiple elements, such as indium and gallium. Specifically, indium gallium arsenide is used as the bottom layer in the three-layer structure. Sharp optimized the balance between indium, gallium, and arsenic to ensure maximum light absorption across the solar spectrum. ![Solar Cell](http://i.bosscdn.com/blog/20/13/05/071008_97427000.jpg) Sharp's Compound 3-Junction design incorporates a unique layered structure: the middle layer is made of gallium arsenide, while the top layer consists of indium gallium phosphate. This three-layer configuration allows for better performance and durability. Sharp started developing these multi-junction solar cells back in 2000, aiming to create more efficient, lightweight, and durable solar panels for space applications. Moving forward, the company plans to leverage these advancements to accelerate real-world implementation and further improve solar technology.

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Type
Axle
Load
The
G.W.
density
per
year
The
highest
passenger
train
speed
The
highest
freight
train
speed
Rail
Type
Gauge
Min.
curve
radius
Length 		Width Height Weight
Rail
base
slope

End 		center End center
(t) (Mt.km/km) (km/h) (km/h) (kg/m) (mm) (m) (mm) (mm) (mm) (kg)
YII-F 25 25~50 ≤120 ≤80 60/50 1435 ≥300 2500 294.5 244.5 230 165 251 1:40
XII 25 25~50 ≤160 ≤80 60/50 1435 ≥300 2500 306.5 246.5 235 175 285 1:40
IIZQ-C 25 25~50 ≤160 ≤80 60/50 1435 ≥300 2500 274.5 274.5 230 221.5 280 1:40
IIIa 25 >30 200 90 70/60 1435 ≥300 2600 320 280 260 185 370 1:40
IIIb 25 >30 200 90 70/60 1435 ≥350 2600 320 280 235 185 370 1:40
IIIc 25 >30 200 90 70/60 1435 ≥300 2600 320 280 260 185 370 1:40
IIIQ 25 25~50 120~160 90 75/60 1435 ≥300 2600 320 280 240 195 370 1:40
IIIQa 25 25~50 200 90 60/50 1435 ≥300 2600 320 320 240 240 406 1:40
IIIQc 25 25~50 200 90 60/50 1435 ≥300 2600 320 320 240 240 406 1:40
KZ 25 25~50 ≤160 ≤80 60/50 1435 ≥300 2500 542 542 205 155 548 1:40
701 25 25~50 200~250 60 1435 ≥300 2400 288 255 190 1:40

Wenfu
railI
25 		25~50 ≥200 60 1435 ≥300 2400 288 205 189 1:40
SK-1 25 25~50 200~250 60 1435 ≥300 2400 314 225 227 1:40
SK-2 25 25~50 200~250 60 1435 ≥300 2400 314 275.5 242 1:40
Plate 1 1435
Plate 2 1435 1:04


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