Jeong Jaeki, Kim Haeyeon, Yoon Yung Jin, Walker Bright, Song Seyeong, Heo Jungwoo, Park Song Yi, Kim Jae Won, Kim Gi-Hwan, Kim Jin Young
Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 South Korea
Department of Chemistry, Kyung Hee University Seoul 02447 Republic of Korea.
RSC Adv. 2018 Jul 3;8(43):24110-24115. doi: 10.1039/c8ra02637h. eCollection 2018 Jul 2.
We herein demonstrate n-i-p-type planar heterojunction perovskite solar cells employing spin-coated ZnO nanoparticles modified with various alkali metal carbonates including LiCO, NaCO, KCO and CsCO, which can tune the energy band structure of ZnO ETLs. Since these metal carbonates doped on ZnO ETLs lead to deeper conduction bands in the ZnO ETLs, electrons are easily transported from the perovskite active layer to the cathode electrode. The power conversion efficiency of about 27% is improved due to the incorporation of alkali carbonates in ETLs. As alternatives to TiO and n-type metal oxides, electron transport materials consisting of doped ZnO nanoparticles are viable ETLs for efficient n-i-p planar heterojunction solar cells, and they can be used on flexible substrates roll-to-roll processing.
我们在此展示了采用经包括LiCO、NaCO、KCO和CsCO在内的各种碱金属碳酸盐修饰的旋涂ZnO纳米颗粒的n-i-p型平面异质结钙钛矿太阳能电池，这些碱金属碳酸盐可以调节ZnO电子传输层（ETL）的能带结构。由于这些掺杂在ZnO ETL上的金属碳酸盐导致ZnO ETL中更深的导带，电子易于从钙钛矿活性层传输到阴极电极。由于在ETL中掺入了碱金属碳酸盐，功率转换效率提高到了约27%。作为TiO和n型金属氧化物的替代物，由掺杂的ZnO纳米颗粒组成的电子传输材料是用于高效n-i-p平面异质结太阳能电池的可行ETL，并且它们可用于柔性基板的卷对卷加工。
