Martin Green has made highly significant contributions to the physics and technology of photovoltaic cells and other photoelectric devices. His contributions to physics include the elaboration of metal-insulator-semiconductor tunnelling structures, and the role of Auger recombination in silicon photovoltaic cells. His contributions to technology include several techniques for substantially increasing the efficiency of silicon solar cell, the development of new fabrication techniques for silicon MOSFETs, and a leading role in the development of Schottky charge-coupled devices (CCDs) for infrared detector arrays. He has also developed comprehensive device models.