LONGi leading Mono PERC cell technology development

Share on facebook
Share on twitter
Share on linkedin
Share on reddit
Share on email

SPONSORED: As the largest monocrystalline silicon manufacturer, LONGi Group has been at the forefront of the development of monocrystalline silicon cell technologies. These technologies are not limited to the monofacial P-type PERC cells (such as LONGi's Hi-MO1), but also incorporate the innovative bifacial PERC cell (Hi-MO2), which will be discussed in detail in this article. 

The technology of Passivated Emitter and Rear Cells (PERC) originated from the 1990s and since then monocrystalline PERC has become increasingly popular due to its great efficiency. According to Taiwan based market research firm EnergyTrend, PERC capacity will reach 61GW and account for 44% of market share by 2020. 

Based on research conducted by German institute ISFH, the efficiency of mass-produced monocrystalline P-type PERC cells could reach 24%, approaching that of those using HIT and IBC technology.

Currently, LONGi production P-type mono-facial PERC cell efficiency, as well as bifacial PERC cell front side efficiency, has reached 21.3% on average. The bifacial PERC cell rear side efficiency remains at 16%-16.5%, 75% of that of front side. Moreover, the power of the 60-cell conventional PERC module (glass/backsheet) reaches 312.1W, while the bifacial PERC module with double-glass lamination could produce 307W from the front side and 234.1W from the rear side.

In 2018, the production efficiency of monofacial PERC cells as well as bifacial cells will reach 21.6%. According to LONGi, PERC cell production efficiency will go up to 22% on the front side and 17.5% for the rear side by 2020.

Reference: Institute for Solar Energy Research in Hamelin (ISFH) IEEE Journal of Photovoltaics (Volume: PP, Issue: 99).

Bifacial PERC modules are known to utilize the reflected and diffuse light reaching the rear surface to generate electricity. However, a number of factors may interfere with the light arriving at the back side of the modules. We investigated the influence of various topographical characteristics and reflectivity on bifacial power gain. This reveals that the module (72-cell) power will reach up to 450W when the reflectivity value is 25%, as shown in Table 1, which verifies LONGi bifacial modules’ impressive photoelectric conversion performance.

According to our experimental data, the conventional Mono PERC module has demonstrated ~3% higher energy yield than a multi-crystalline module. This can be attributed to Mono PERC's lower temperature coefficient, lower operating temperature and better low light performance. In outdoor field testing, the rear side of bifacial PERC modules could generate 14.9% more power output than mono-facial modules with fixed mount. Additionally, the rear side of LONGi's Bifacial PERC module (Hi-MO2), combined with a tilted single-axis tracker, is capable of generating 21.4% more power output than multi-crystalline modules (also with tilted single-axis tracker).

Read Next

May 4, 2021
Leading monocrystalline wafer producer and ‘Solar Module Super League’ (SMSL) member, LONGi Green Energy and subsidiary, LONGi Solar respectively, have continued an unprecedented sales run, notching up first 2021 revenue (operating income) of RMB 15.85 billion (US$2.44 billion), its second highest quarterly figures.
April 29, 2021
In an exclusive interview with PV Tech’s Carrie Xiao, LONGi’s vice president of its business division Jun Lv has stressed that the industry must move beyond discussions around wafer and module size and refocus on innovations driving conversion efficiency and reduce cost
PV Tech Premium
April 26, 2021
LONGi’s ascent to the top of the solar module shipments league table captured headlines last week, but it also cements the view that consolidation in the sector is inevitable, with an oligarchy of majors dominating market share. Carrie Xiao assesses the prospects of those top five companies as 2021 heats up.
April 24, 2021
As polysilicon pricing continues to be volatile, this week’s Premium Briefing explores just how high pricing could climb to, when it may normalise, and what the likely impacts are on the downstream solar sector.
PV Tech Premium
April 22, 2021
Mark Osborne provides in-depth analysis of LONGi's new 2021 guidance and its capacity expansion plans, as the solar industry's new shipments leader aims to break away from the rest of the pack.
April 21, 2021
‘Solar Module Super League’ (SMSL) member LONGi Solar has reported total PV module shipments of 24.53GW in 2020, setting a new industry shipment record and leapfrogging rivals to become the largest PV manufacturer in the world for the first time.

Subscribe to Newsletter

Upcoming Events

Solar Media Events
May 11, 2021
Upcoming Webinars
May 26, 2021
Session 1 - 7:00 AM (BST) | Session 2 - 5:00 PM (BST)
Solar Media Events
June 15, 2021
Solar Media Events
July 6, 2021