Dye-sensitized solar cells (DSSCs) have attracted significant interest in the scientific community in recent years due to their advantages such as low fabrication cost, facile fabrication and capability to increase the DSSC performance. Up to date, there are a lot of efforts that have been performed to enhance the DSSC performance by introducing compact layers (CLs) and light scattering layer (LSLs) at the TiO₂ photoactive layer. The CLs can reduce the recombination effect by preventing direct contact between transparent conductive oxide substrates and redox electrolytes. The CLs can reduce current leakage and generate more photocurrent and voltage, resulting in high DSSC performance. The performance of DSSCs also can be improved via the addition of LSLs. The LSLs must be larger than the titanium dioxide (TiO₂) nanoparticles (typical photoanode in DSSCs) to trap more incident light and can excite more electrons, producing high power conversion efficiency. This review will be focused on the modification of the TiO₂ photoactive layer by introducing CLs and LSLs to reduce the recombination effect and increase the light scattering effect for enhancing the DSSC performance. This review highlights various approaches and morphologies to prepare the CLs and LSLs using metal oxides and carbon-based materials.

染料敏化太阳能电池（DSSC）近年来由于其诸如低制造成本，易于制造以及提高DSSC性能的能力等优点而引起了科学界的广泛关注。迄今为止，已经进行了很多努力来通过在TiO ₂光敏层上引入致密层（CL）和光散射层（LSL）来增强DSSC性能。通过防止透明导电氧化物基板和氧化还原电解质之间的直接接触，CL可以降低复合效应。CL可以减少电流泄漏并产生更多的光电流和电压，从而实现高DSSC性能。通过添加LSL，也可以提高DSSC的性能。LSL必须大于二氧化钛（TiO₂）纳米粒子（DSSC中的典型光电阳极）捕获更多的入射光并可以激发更多的电子，从而产生高功率转换效率。本文将重点介绍通过引入CL和LSL来减少重组效应和增加光散射效应以增强DSSC性能，从而修饰TiO ₂光敏层。这篇综述重点介绍了使用金属氧化物和碳基材料制备CL和LSL的各种方法和形态。