2013年职称英语考试《理工类A级》考试真题_职称英语考试真题理工类

2013年职称英语考试《理工类A级》考试真题

In a pair of studies, Joshua Pearce, an associate professor of materials science andengineering, has devised a(55) __________in the form of a better PVT made with a different kindof silicon. His research collaborators are Kunal Girotra from Thin Silicon in California andMichael Pathak and Stephen Harrison from Queens University, Canada.

Most solar panels are made with crystalline silicon, but you can also make solar cells out ofamorphous silicon, commonly known (56)__________thin-film silicon. They dont create as muchelectricity, but they are lighter, flexible, and cheaper. And, because they(57) __________ muchless silicon, they have a greener footprint. (58) __________, thin-film silicon solar cells arevulnerable to some bad news physics in the form of the Staebler-Wronski effect.

That means that their efficiency drops when you (59) __________ them to light -- pretty much the worst possible effect for a solar cell, Pearce explains, which is one of the(60) __________thin-film solar panels make up only a small fraction of the market.

However, Pearce and his team found a(61) __________ to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new(62) __________ of PVT. You dont haveto cool down thin-film silicon to make it work. In fact, Pearces group discovered that byheating it to solar-thermal operating temperatures, near the boiling(63) __________ of water, theycould make thicker cells that largely(64) __________the Staebler-Wronski effect. When theyapplied the thin-film silicon directly to a solar thermal energy collector, they also found that bybaking the cell once a day, they (65) ___________ the solar cells electrical efficiency by over 10percent.