综合设计和开发活动的目标是为了进一步改善功率密度，提高能量效率并减少制造成本。
The objective of the integrated design and development activity is to further improve power density, increase energy efficiency, and to reduce manufacturing cost.
研究者正把这项设计应用到制造太阳能电池的半导体材料上，这样他们希望在节省材料成本的同时仍可以提供高效率的能量转换。
Researchers are applying the design to semiconductor materials to make solar cells that they hope will save money on materials costs while still offering high power-conversion efficiency.
如何提高能量转换效率，是设计该类放大器的重点和难点。
How to improve the efficiency of the energy transforming is the emphasis and difficulty in designing such amplifier.
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