Ma Shuang, Yang Yi, Liu Cheng, Cai Molang, Ding Yong, Tan Zhan'ao, Shi Pengju, Dai Songyuan, Alsaedi Ahmed, Hayat Tasawar
Beijing Advanced Innovation Center for Soft Matter Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , China.
NAAM Research Group, Faculty of Science , King Abdulaziz University , Jeddah 21589 , Saudi Arabia.
ACS Appl Mater Interfaces. 2019 Sep 4;11(35):32509-32516. doi: 10.1021/acsami.9b10266. Epub 2019 Aug 23.
Nontoxic and stable materials are one of the necessities for commercialization of solar devices. However, most lead-free absorbers have limited light absorption range as well as poor morphology. In this work, a vertically oriented BiI template induced by Li-bis(trifluoromethanesulfonyl)imide dopant is intimately integrated with a light-absorbing polymer to form an organic-inorganic BiI/polymer heterojunction absorber in solar cells. Compared with the dopant-free BiI/polymer, the broadened light absorption of the doped BiI/polymer enhances the external quantum efficiency (EQE) of the device beyond 500 nm as well as extends the EQE edge from 650 to 750 nm, which significantly increases the short-circuit current () of the device from 1.3 to 3.7 mA cm. The polymer top layer is further optimized to improve charge extraction, which achieved the highest recorded (7.8 mA cm) for BiI-based solar cells and an efficiency of 1.03%. Moreover, the encapsulated device shows no degradation after storing in ambient conditions for nearly 2 years.
无毒且稳定的材料是太阳能设备商业化的必要条件之一。然而，大多数无铅吸收剂的光吸收范围有限且形貌不佳。在这项工作中，由双（三氟甲磺酰）亚胺锂掺杂剂诱导的垂直取向BiI模板与吸光聚合物紧密结合，在太阳能电池中形成有机-无机BiI/聚合物异质结吸收体。与无掺杂剂的BiI/聚合物相比，掺杂的BiI/聚合物拓宽的光吸收增强了器件在500 nm以上的外量子效率（EQE），并将EQE边缘从650 nm扩展到750 nm，这显著提高了器件的短路电流（），从1.3 mA cm提高到3.7 mA cm。聚合物顶层进一步优化以改善电荷提取，这实现了基于BiI的太阳能电池记录的最高（7.8 mA cm）和1.03%的效率。此外，封装后的器件在环境条件下储存近2年后没有降解。
