Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells
Yong Hui Lee, Jingshan Luo, Robin Humphry-Baker, Peng Gao, Michael Grätzel and Mohammad Khaja Nazeeruddin
The influence of the unreacted PbI2 to the performance of perovskite solar cells is investigated. The optimized morphology of the PbI2under layer is found to be essential to form a dense perovskite layer preventing recombination by direct contact between TiO2 and a hole transporting layer, and increase the charge collection efficiency.
Morphological Control for High Performance, Solution-Processed Planar Heterojunction Perovskite Solar Cells
Deepu J. Giles E. Eperon, Victor M. Burlakov, Pablo Docampo, Alain Goriely and Henry J. Snaith
The critical role of perovskite morphology in planar heterojunction perovskite solar cells is probed and understood. Dewetting of perovskite films is minimized, to achieve uniform 100% coverage perovskite layers. Solution cast planar heterojunction solar cells with efficiencies of up to 11.4% are fabricated, a new record for such cells with no mesoporous layer.
Jang Yeol Lee, Kwang-Hoon Lee, Young Jin Kim, Jeong Sook Ha, Sang-Soo Lee and Jeong Gon Son
Highly crumpled graphene balls with a sea-urchin-shaped template strategy are facilely fabricated in bulk quantities with high yield through simultaneous etching–reduction of graphene oxide-encapsulated iron oxide. The crumpled balls, which exhibit significantly larger surface area and higher water-dispersion stability than those of stacked graphene and other crumpling approaches, and their 3D macroporous networks present superior gravimetric and volumetric capacitance of electrochemical energy-storage electrodes.
