Patent ID: 9523644
Filing Date: 2016-12-20
CPC Classification: G01N,H01L,Y02E

Claim Text:
1. A method for creating a trench in a product for a thin film solar cell, the product comprising a substrate, a lower electrode layer and a light absorbing layer which are layered in this order, and including a first trench in the lower electrode for separating the lower electrode, the light absorbing layer covering the lower electrode layer and the trench, the method comprising the steps of: receiving infrared rays from the product to obtain brightness data from an area of the product including the first trench by an infrared camera which cannot detect visible light but detects infrared rays having a wavelength which passes through the light absorbing layer and is located on a side from which the first trench is formed and above the light absorbing layer, the area having a width greater than that of the first trench, the brightness data representing a radiation intensity distribution of the infrared rays from the area, determining borders of the first trench in the area from the brightness data, determining a position and a direction of a baseline to form a second trench in the product in relation to the borders of the first trench, and forming the second trench in the product.