碳基钙钛矿太阳电池背界面接触调控及其对器件性能的影响机制研究

Device stability is currently the main bottleneck restricting the further development and industrialization of perovskite solar cells. In recent years, carbon-based perovskite solar cells, constructed with carbon electrodes instead of metal electrodes, have shown great advantages in improving device stability. However, attributed to the poor back-interface contact between carbon electrode and perovskite/hole transporting layer, the efficiency of carbon-based perovskite solar cells is still lower. In order to address this issue, we propose to study on the back-interface contact regulation of carbon-based perovskite solar cells and its effect on device performance: we propose to develop a new-type flexible carbon electrode with adhesiveness, regulating the interface connection between carbon electrode and perovskite/hole transporting layer, establishing excellent back-interface physical contact, and investigating the structure-efficiency relationship between carbon-electrode microstructure and device efficiency; Further, passivation of interface defect states and regulation of interface energy band structure are carried out to optimize the back-interface electrical contact and regulate the back-interface carrier transporting characteristics; Subsequently, we will investigate long-term device stability systematically and reveal the internal mechanism of back-interface contact properties influencing device stability. This project can provide theoretical basis for efficient and stable perovskite solar cell technology, and promote its industrialization process.

器件稳定性是当前制约钙钛矿太阳能电池进一步发展和产业化的主要瓶颈。近年来，碳电极取代金属电极构筑的碳基钙钛矿太阳能电池在提高器件稳定性方面展现了极大的优势，然而碳电极与钙钛矿/空穴传输层之间存在的背界面接触问题使得碳基钙钛矿太阳能电池的效率仍然偏低。针对这一问题，本项目拟开展碳基钙钛矿太阳能电池背界面接触调控及其对器件性能的影响机制研究:发展具有粘附性的新型柔性碳电极，调控碳电极与钙钛矿/空穴传输层之间的界面粘附作用，构建优异的背界面物理接触，并探究碳电极微观结构与电池效率之间的构效关系；同时，在钝化界面缺陷态、调控界面能带结构等界面工程的协同作用下，优化背界面电学接触性质，调控背界面载流子输运特性；在此基础上，系统研究测试器件的长期稳定性，揭示背界面接触性质影响器件稳定性的内在机制。本项目可为高效稳定钙钛矿太阳能电池技术提供理论依据，促进钙钛矿太阳能电池的产业化进程。

器件稳定性是当前制约钙钛矿太阳能电池进一步发展和产业化的主要瓶颈。近年来，碳电极取代金属电极构筑的碳基钙钛矿太阳能电池在提高器件稳定性方面展现了极大的优势，然而碳电极与钙钛矿/空穴传输层之间存在的背界面接触问题使得碳基钙钛矿太阳能电池的效率仍然偏低。针对这一问题，本项目开展了碳基钙钛矿太阳能电池背界面接触调控及其对器件性能的影响机制研究。首先我们发展了一种具有粘附性的新型柔性碳电极，通过调控碳电极与钙钛矿/空穴传输层之间的界面粘附作用，构建优异的背界面物理接触，并探究了碳电极微观结构与电池效率之间的构效关系。同时，通过钝化界面缺陷态、调控界面能带结构等界面工程进一步优化背界面电学接触性质，调控背界面载流子输运特性，最终获得了光电转换效率20%以上碳基钙钛矿太阳能电池。在此基础上，检测了碳基钙钛矿太阳能器件的长期稳定性，并揭示背界面接触性质影响器件稳定性的内在机制。本项目可为高效稳定钙钛矿太阳能电池技术提供理论依据，促进钙钛矿太阳能电池的产业化进程。