| TiO2 blocking layer grown by nanocluster deposition for improved perovskite solar cell performance |
| Thanh Tung Duong |
| Chungnam National University |
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Keywords: NCD, blocking layer, Perovskite solar cells.
There have been some very interesting reports dealing with the application of perovskite sensitizer to hybrid organic-inorganic solar cells, since the power conversion efficiency (PCE) of lead halide perovskite (CH3NH3PbX3, X = Cl,Br, I)–based thin film photovoltaic devices has skyrocketed from 3.8% to more than 19% in just 4 years (1–6). In a typical perovskite solar cell, a several-hundred-nanometer-thick absorber layer, either with or without mesoporous scaffold, is sandwiched between the electron and hole transport layers (ETLs and HTLs, respectively). Upon the absorption of incident photons, carriers are created in the absorber that travel through a transport pathway including the ETL or HTL, the electrodes, and each interface in between. To increase the PCE, it is essential to precisely manipulate carriers along the entire pathway from the absorber to both electrodes.
In this study, we demostrate the thickness effect of compact-TiO2 blocking layer and TiO2 mesoporous layer to the perovskite sensitizer solar cells perfomance. The TiO2 blocking layer prepared by nano-cluster deposition (NCD) played an important role in increasing the contact area between TiO2 thick films and FTO, which helped prevent electron movement back to the electrolyte, and decreased the contact resistance at the TiO2/FTO interface, whereas mesoporous TiO2 layer fabricated by spincoating method acts as an electron transportation layer. The photovoltaic performance of perovskite solar cells was enhanced at 80 nm TiO2 BL and 600 nm TiO2 mesoporous layer, following parameters were obtained: Jsc = 21.0 mAcm−2, Voc = 0.89 V, FF = 62%, and efficiency (¥ç) = 11.5%.
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