TY  - GEN
AU  - Polman,Albert
AU  - Knight,Mark
AU  - Garnett,Erik C
AU  - Ehrler,Bruno
AU  - Sinke,Wim C
TI  - Photovoltaic materials: Present efficiencies and future challenges
SN  - 1095-9203
PY  - 2016///0428
N1  - Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Review
UR  - https://doi.org/10.1126/science.aad4424
ER  -