Ulica Solar’s QIN series 0BB TOPCon module features ultra-fine continuous triangular ribbons based on cell interconnection technology
This module has a rated power and efficiency of 660 W and 24.43%, respectively
The absence of busbar ribbon reduces cell nominal operating temperature and percentage usage of silver-based metallization vis-à-vis the traditional TOPCon counterpart
Advancements in the wattage and efficiency of a PV module, featuring any advanced cell technology, primarily rely on achieving an optimal balance between electrical and optical gains. However, doing so in a cost-effective manner is key to ensuring the product remains commercially competitive.
Ulica Solar, a vertically integrated PV manufacturer engaged in wafer, cell, and module production, introduced its innovative QIN series 0BB TOPCon module featuring patented composite finger technology at SNEC 2025 in Shanghai. Jacob Fang, Regional Manager at Ulica Solar, gave a brief overview of the product to Shravan Chunduri, Head of Technology at TaiyangNews, during a visit to the company’s booth.
Performance
According to the product datasheet, based on 144 pieces of 0BB TOPCon half-cell matrix, this module boasts a power output and an efficiency of up to 660 W and 24.43%, respectively. Sized at 2,382 × 1,134 × 30 mm, this module delivers up to 40 W power gain compared to its traditional TOPCon counterpart of the same size, says Fang. He adds that this high power density (W/m²) and efficiency underline the product’s multiple technological advancements.
Optical & Electrical Gain
Its busbarless (0BB) TOPCon cell, featuring more than 200 ultra-fine continuous triangular ribbons, exhibits enhanced reflectivity of incident sunrays vis-à-vis round or flat busbar ribbons, which enables higher optical gain. This feature results in enhanced power density and efficiency gain, added Fang. Additionally, the adaptation of half-wafer-based TOPCon cells denies potential power and efficiency loss stemming from the edges of the laser-cut half cells. In addition, the cell-to-cell current flows directly through fingers, instead of the busbar ribbons, which facilitates a lower working temperature of the underlying solar cells. This makes it suitable for high-temperature field conditions, like in the Middle East region with high field temperatures, added Fang. The product datasheet says the module’s nominal operating cell temperature (NOCT) is rated at 43°C.
Endurance
Weighing 32.0 kg, this module is laminated with 2 mm-thick front and rear glass. To mitigate any potential risk emanating from high mechanical stresses originating from high wind and snow loads, this product is certified to up to 2,400 Pa rear and 5,400 Pa front load, respectively. Additionally, passing the anti-PID test under 85°C damp heat and 85% relative humidity for up to 192 hours validates the product’s anti-PID capability.
Cost Optimization
On the cost frontier, this module, without any busbar, can reduce the usage of silver (Ag), a scarce and costly raw material needed for the metallization process, by up to 70%, compared to a traditional TOPCon product, explained Fang.
Warranty
The company offers a product warranty of up to 15 years and a performance warranty of 30 years for this product.