Quantum dot sensitized solar cells (QDSSCs) are a widely studied system for harvesting light and converting it to electrical energy. The distinguishing quality of QDSSCs in the realm of solar energy conversion is that quantum dots (QDs)—typically CdS or CdSe—are the light absorbing component instead of dyes or silicon. QDs are an attractive photoabsorber because their energy of absorption in the visible region can be tuned based on their size and because they have large absorption coefficients. Great strides are being made into developing new, more efficient absorber layers on the photoanode; however, instability of the cathode material prevents these cells from working effectively. The QDSSC photoanode is and has been extensively studied but the cathode has not. As a consequence, there is a need to develop cathodes for this technology.