The heart of each Panasonic HIT solar panel is the solar cell. In 1990 SANYO scientists began to develop heterojunction technology. It was a step forward compared to the classic monocrystalline cell, with different materials from the crystal wafer in the p-n junction. This invention aims to resolve a key issue of solar technology: reducing losses at the boundaries of the cells. Thanks to this breakthrough, our cells with heterojunction continue to break efficiency and performance records at high temperatures. In March 2016 the record for the efficiency of a solar panel in a commercial size was achieved by Panasonic with a 275W panel having an aperture area of 1,1568 m².