Ambipolar transistors are attractive for realizing complementary-like organic integrated circuits, which operate with low power dissipation, wide noise margins and great operational stability.
Others have combined glass with solar cells that are thinner and smaller but they can have drawbacks like lower power efficiency and less transparency.
It's similar to the infrared used in TV remote controls, but TV remotes send the signal in many directions which is good for simple low power data communication.
Lastly, the T800 sports a low power short-range radar system which it can use to triangulate and locate the position of hidden snipers upon being hit- assuming it survives the initial hit.