Low-noise organic photodetectors Although the high performance and low cost of visible light silicon photodetectors suffice for most applications, their small size and rigid nature are not optimal for applications such as wearable sensors. Organic photodetectors can be flexible and large in area but are often noisy. Fuentes-Hernandez et al. found that optimized choices of the semiconductor and electrode materials that improve diode characteristics enable organic photodetectors that can detect low light levels with low noise. Science , this issue p. 698