NICOP - Multidimensional perovskites materials for air-stable and efficient photovoltaics
Abstract
Perovskite materials offer an enormous opportunity for deploying solar photovoltaics. Perovskites areparticularly attractive for a" variety of applications because they can be easily solution-processed, theyare compatible with established scale-up techniques wit""h potential solar-to-electrical power conversionefficiency above 22%, which is close to silicon based photovoltaics. However, the p""otential stabilityissue remains a major challenge for halide perovskite solar cells (PSCs), and it needs to be fullyexamined and v""alidated. Generally, perovskite solar cells are susceptible to four main factors whichare 1) oxygen and moisture, 2) UV light, 3) t"emperature and 4) instabilities due to complex interfacialchemistry. Owing to the ionic characteristic nature in perovskite (CH3NH3PbI3) tends to hydrolyze inthe presence of moisture which leads to the coexistence of CH3NH2 and HI in the film. HI further drivesthe degradation process by photochemical reaction under UV irradiation and redox reaction in thepresence of oxygen.Development of lower-dimensional layered perovskites derived from their 3D counterparts byincreasing the distance between the interconnected inorganic sheets with organic cations. Suchmultifunctional organic cations can enable hydrogen or halogen bonding between the organic cationand inorganic framework to reduce the band gap while increasing the stability and charge carriermobility. The aim of this project is to develop rationally-designed air-stable perovskite absorbers forhigh efficiency solar photovoltaics through material engineering approaches to strengthen moistureresistivity in perovskite materials and minimizing the contact between moisture and perovskites. Theprogram includes investigations on multifunctional interfaces for robust architectures and fundamentaldevice physics to improve charge transport and collection. Stability and process uniformity will beaddressed in the project towards the translation of small solar devices to large substrate area substrate.Operational reliability of the solar cells will be tested under standard temperature (85o C) and humidity(85 % RH) conditions and repeated thermal cycles (200 cycles from -40o C to +85o C).
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 03, 2017
- Source ID
- N629091712155
Entities
People
- Subodh Mhaisalkar
Organizations
- Nanyang Technological University
- Office of Naval Research
- United States Navy