Multi-element lenslet array for efficient solar collection at extreme angles of incidence

Area of Science:

• Optics
• Renewable Energy
• Materials Science

Background:

• Photovoltaics (PV) are crucial for solar power but require optimal sun alignment for efficiency.
• Current PV technology faces challenges in maintaining peak performance across varying sun angles.
• Effective solar energy conversion is limited by the angle of incidence of sunlight.

Purpose of the Study:

• To develop and demonstrate a novel optical solution for enhancing solar power collection.
• To increase the effective optical interaction length of photovoltaic systems.
• To improve energy generation in photovoltaic panels, particularly under non-ideal sun angles.

Main Methods:

• Experimentally demonstrated a bespoke multi-element lenslet array.
• Utilized 3D printing for an optical proof-of-concept.
• Measured power density for optical rays at various angles of incidence (40-80 degrees).

Main Results:

• The lenslet array increased the effective optical interaction length by up to 13 times.
• Demonstrated increased power density for incident rays between 40 and 80 degrees.
• Projected a potential increase in daily power generation by a factor of 1.36 for amorphous silicon solar panels.

Conclusions:

• The novel lenslet array design offers a significant improvement in solar energy collection efficiency.
• This optical approach can potentially be retrofitted to existing solar panels.
• The technology shows promise for efficient solar collection in extreme conditions and diverse applications.