TY - GENERIC DO - 10.20944/preprints201911.0075.v1 UR - http://dx.doi.org/10.20944/preprints201911.0075.v1 TI - Highly Efficient, ITO-Free Polymer Solar Cells Using Ultrathin Copper Film as Transparent Electrode T2 - Preprints AU - Liang, Quanbin AU - Luo, Guoping AU - Cheng, Xiaoping AU - Wu, Hongbin PY - 2019 DA - 2019/11/07 PB - Preprints