Which brand solar panel is the world's most efficient?

What kind of company is the world's most efficient solar cell solar panel to date?
first of all, the best known three companies are candidates
LG of Korea, Sunpower of USA Panasonic of Japan
all three companies are producing products that exceed 20% of the panel standard

LG Sunpower have similar technological backgrounds, they use N type cell and remove the bus bar from the front side of module with back contact
Panasonic uses a unique technology called HIT, a so-called "Hetero junction" technology that uses crystalline solar cells and a-Si thin film solar cell technology combined

But there are no champions in the three company
champion is a small and medium-sized solar panel manufacturer in the United States
this company made solar cells with the same technology as Panasonic, and they applied the soldering technology called "Smart Wire System"
It uses a very fine wire system, similar to the multi-wire systems used in the LG neon2. It can be soldered at a lower 140 degree than the wire system used in conventional solar panels
his solar panels with these technologies have achieved 24% efficiency on a panel basis

it's not easy to look at the market because his produce capacity is not big
Basically, high-efficiency products can reduce the installation area, and if the same capacity solar power generation facility is installed, the number of solar panels to be installed can be reduced, which is advantageous.

The problem is the very high price, compared to the general efficiency of the market versus the product, which is twice as much
but a lot of these products are going to be competitive in the technology development, so it will surely help to expand the market in the long term