The role of the hole-transport layer in perovskite solar cells - reducing recombination and increasing absorption
2014 (English)In: 2014 IEEE 40TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), IEEE , 2014, 1563-1566 p.Conference paper (Refereed)
The role of the hole-transport layer (HTL) in CH3NH3PbI3 perovskite solar cells is investigated. It is found that it mainly serves three purposes: First, deposited prior to the gold electrode, it avoids direct contact of the metal electrode with the meso porous TiO2-perovskite layer, and therefore increases the selectivity of the contact. This reduces recombination as evident from an increased open-circuit voltage and a higher luminescence efficiency. Second, the HTL increases the internal quantum efficiency independent of applied voltage and illumination wavelength by reducing (diffusion) losses of charges. Third, due to a smoothing of the TiO2-perovskite mesoscopic layer the HTL increases the reflectivity of the gold electrode, allowing for a second path of the light through the absorber. Both effects result in an enhancement of the short-circuit current density.
Place, publisher, year, edition, pages
IEEE , 2014. 1563-1566 p.
solar cell; perovskite; recombination; hole transport layer; luminescence; internal quantum efficiency; incident-photon-to-electron conversion efficiency
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-132320DOI: 10.1109/PVSC.2014.6925216ISI: 000366638901174ISBN: 978-1-4799-4398-2OAI: oai:DiVA.org:liu-132320DiVA: diva2:1043661
40th IEEE Photovoltaic Specialists Conference (PVSC)