Researchers from Korea have developed a transparent solar cell made from inexpensive silicon that can replace glass windows in houses and buildings and generate a good amount of electricity. Traditional solar panels are quite expensive and mostly used on rooftops. Researchers hoping these transparent solar cells can be used as exterior glass windows. Researchers took 1-centimetre square cells made from opaque crystalline silicon, then created tiny holes for the passage of light. A drawback of the new solar cells is that they are often less efficient. Researchers are now hoping to develop a more efficient solar cell to replace the expensive traditional solar panels.