| 초록 |
As promising photo-absorbing materials for photovoltaics, organolead halide perovskite solar cells (PSCs) have attracted lots of attention and achieved a comparable power conversion efficiency (PCE) to the silicon-based solar cells, although the perovskite materials can absorb only visible light. Hence, a remaining challenge to enhance the PCE is to utilize near infrared (NIR) light in solar light spectrum. One of the easiest ways to utilize the NIR is to incorporate NIR active materials to the PSCs such as up-conversion nanoparticles (UCNPs); however, such strategy is difficult to adopt into the PSCs due to the inherent vulnerability of perovskite materials towars moisture. In this work, we present NIR-utilizing PSCs by locating UCNPs within the PSC structure by a simple dry transfer technique. Maximum PCE of 15.56 % was obtained in the case of PSC having the UCNPs located between spiro-OMeTAD layer (hole transport layer) and gold (Au) top electrode, which is about 8 % enhancement compared to the reference without those. This enhancement came from the combined effects of NIR light utilization and the surface plasmon resonance (SPR) phenomenon orginating from the Au top electrode, which was interfacing the UCNPs. |
