Analysis of Solar Photovoltaic Development and Constraints

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Analysis of Solar Photovoltaic Development and Constraints History In 1954, Bell Laboratories have developed the first solar cell and the energy efficiency was 6% back then (Goetzberger et al. 2002). The figure has been raised to over 10% within 18 months (Green. 2009). For a long period of time, solar energy has mainly been applied into the power supply of space vehicles (Goetzberger et al. 2002). On account of the substantial development in the performance of silicon cells, the efficiency of solar energy conversion has reached 25% (Green. 2009). The growth over time of solar efficiency is delineated in Figure 1: Figure 1 – Development in Solar Efficiency since 1940 (Green. 2009) As shown in the diagram, there are majorly three major breakthroughs in solar efficiency. According to Green, the first one was in 1950s, powered by better cell design, crystal growth and junction diffusion. The following phase was in 1970s, boosted by the enhanced coatings, surface texturing, development in shallow junctions and photolithographically defined metallization. Finally, since mid-1980 the solar technology has benefited from ameliorations in bulk lifetimes, light trapping and passivation, resulting in more than 5% net growth in efficiency (Green. 2009) Importance of Solar and other Renewable Energy Sources According to the projections from the United Nations, the world population will reach 9.3 billion in 2050 (Lee. 2011). The figure is expected to reach 10.1 billion by
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