TY - BOOK

T1 - Process development and optical simulation of fully evaporated perovskite solar cells

AU - Diederich, Marvin

N1 - Doctoral thesis

PY - 2023

Y1 - 2023

N2 - Perovskites are one of the most promising materials for next generation photovoltaics, especially the combination of a perovskite top solar cell with a silicon bottom solar cell in a tandem solar cell. Perovskite solar cells however suffer from degradation due to several ambient effects and long term stability as well as process reproducibility are still major issues to overcome. In this thesis I will explain the processing of perovskite solar cells with the evaporated perovskite MAPbI3. I will show that these devices currently suffer mostly from two effects that limit efficiency and cause degradation. The first is degradation due to moisture mainly caused by hygroscopic MAI in the perovskite layer, since our processing and measurement partially takes place in ambient atmosphere.The second effect is caused by ionic movement in the perovskite, which causes hysteresis effects as well as long term degradation once the metal electrode of the perovskite solar cell is deposited. I will outline how to measure and minimize both effects in future with optimisations in the processing and measurement conditions. First experiments including some of these optimisations already show cell efficiencies up to 17%. In the second part of this work I will present optical simulations of both single-junction perovskite and perovskite-silicon tandem solar cells. For the perovskite single-junction cells with evaporated MAPbI3 I will present an effective medium model that can be used to identify the varying absorption in the PbI2 rich MAPbI3. For the tandem solar cells I will discuss the optical effects of front and rear side texture as well as a novel poly-silicon recombination junction in between the perovskite and silicon subcells.

AB - Perovskites are one of the most promising materials for next generation photovoltaics, especially the combination of a perovskite top solar cell with a silicon bottom solar cell in a tandem solar cell. Perovskite solar cells however suffer from degradation due to several ambient effects and long term stability as well as process reproducibility are still major issues to overcome. In this thesis I will explain the processing of perovskite solar cells with the evaporated perovskite MAPbI3. I will show that these devices currently suffer mostly from two effects that limit efficiency and cause degradation. The first is degradation due to moisture mainly caused by hygroscopic MAI in the perovskite layer, since our processing and measurement partially takes place in ambient atmosphere.The second effect is caused by ionic movement in the perovskite, which causes hysteresis effects as well as long term degradation once the metal electrode of the perovskite solar cell is deposited. I will outline how to measure and minimize both effects in future with optimisations in the processing and measurement conditions. First experiments including some of these optimisations already show cell efficiencies up to 17%. In the second part of this work I will present optical simulations of both single-junction perovskite and perovskite-silicon tandem solar cells. For the perovskite single-junction cells with evaporated MAPbI3 I will present an effective medium model that can be used to identify the varying absorption in the PbI2 rich MAPbI3. For the tandem solar cells I will discuss the optical effects of front and rear side texture as well as a novel poly-silicon recombination junction in between the perovskite and silicon subcells.

U2 - 10.15488/13268

DO - 10.15488/13268

M3 - Doctoral thesis

CY - Hannover

ER -