First Photovoltaic Solar Cell Production Facility of Turkey
Parla Solar panel production facility, which was established in Denizli in 2015, is the largest solar panel production facility in Turkey with a total installed area of more than 33,000 m2, including 16,000 m2 closed area. The facility where solar energy panel is produced in the categories of 255, 260 and 265 watts, has annual panel production capacity of 150 MWp/600 thousand units along with three production lines; one with 30 MW and two with 60 MW.
ell types of Multi crystal, Mono crystal, standard (Al-BSF) and PERC are produced in facility which is the first industrial photovoltaic solar cell production facility of Turkey. The annual production capacity of the facility is equal to approximately 26 million cell production in a year with 130 MW.
Within the scope of TÜBİTAK (Scientific and Technological Research Council of Turkey) – The Project of Developing the National Solar Energy Plant (MİLGES), a Solar Energy Plant of 10 MW capacity shall be established with photovoltaic panels which are produced by Aydem Energy in General Directorate of Agricultural Enterprises in Şanlıurfa-Ceylanpınar with the target of developing the equipment and necessities of photovoltaic based solar energy plants in Turkey and exporting to outer markets. 2.5 millions of solar cell shall be produced for the Solar Energy Plant to be established.
PARLA PERC Technology
- Completely PID free
- Thanks to black silicon technology, low reflection and CTM losses
- LID loss is reduced to less than %1 by special treatment steps in the cell and module production
- High product quality thanks to the inline inspection tools
- Ability to produce both multi and mono, standard and perc cells in the same production line
- 4,5,6 or more busbar printing ability
Unlike standard cells, in PERC cells, rear side is passivated in order to prevent recombination losses which leads to an increase of 1% in the efficiency.
Production of the solar cells takes place in a ISO class 8 clean room with an area of 3200 m2. Mono PERC solar cell process consists of 8 main steps. Quality and efficiency of each process step is kept under control through our inline and standalone optical & electrical characterization devices.
- Diamond wire sawn p-type (boron doped) mono/multi crystalline silicon wafers are inspected by an inline quality control machine which consists of thicknes & resistivity, geometry and microcrack tests. This allows us to assure that all incoming wafers match required specifications.
- Metal-catalyzed chemical etching (MCCE) process is applied which uses a single step for saw damage removal, silver nano-particle deposition and catalytic chemical etching which is followed by further wet-chemistry processing.
- POCl3 deposition is carried out to the sunny side in a low pressure diffusion furnace for the p-n junction formation which gives the wafer its photovoltaic characteristic.
- Emitter layer on the rearside of the wafer generated during the diffusion process is unilaterally isolated from the front side of the wafer and at the same time the phosphorous silicate glass (PSG) is removed from the wafer surface.
- An antireflective layer (SiNx) which is formed by special gasses in a plasma enhanced chemical vapor deposition (PECVD) machine.
- Another stack of layers are formed on the rear side in another PECVD in order to provide good chemical and electrical passivation and prevent recombination losses on the rear side.
- A nanosecond laser is used in order to form contact openings on the rear side and front and rear contacts are formed using screen printing technology.
- Cells are tested and sorted according to their optical and electrical properties and transferred to the module line for solar module production.
SEM image of a wafer surface which is textured by black silicon technology