Perovskite Solar Cells on Corrugated Substrates with Enhanced Efficiency. Issue 46 (27th September 2016)

• Record Type: Journal Article
• Authors: Luo, Yu; Liu, Shuyi; Barange, Nilesh; Wang, Li; So, Franky
• Is Part Of: Small. Volume 12:Issue 46(2016)
• Page Start: 6346
• Page End: 6352
• Publication Date: 2016-09-27
• Subjects: carrier extraction -- corrugated substrate -- efficiency -- light absorption -- perovskite solar cells; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201601974
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract : Organometallic halide perovskites solar cells are fabricated on nano‐scaled corrugated substrates using a sequential deposition method. The corrugated substrates are fabricated using colloidal lithography followed by reactive ion etching. The corrugated structure is found to accelerate the chemical reaction between the sequentially deposited lead iodide (PbI2 ) and methyl ammonium iodide layers to form stoichiometric perovskite films, and the corrugated morphology is preserved at the interface of the hole transport layer (HTL) and the perovskite layer. The shunt resistance of the corrugated devices is found to be higher than that of the planar devices, leading to a higher open circuit voltage ( V OC ) and fill factor (FF) in the corrugated devices. Finite‐difference time‐domain simulation is carried out on both planar and corrugated devices. The results revealed that light absorption is enhanced in the corrugated devices due to the corrugated HTL/perovskite interface, resulting in a significantly higher short circuit current ( J SC ) observed in the corrugated devices. As a result, the average power conversion efficiency increases from 8.7% for the planar devices to 13% for the corrugated devices. Abstract : A simple and scalable method to fabricate nano‐scaled corrugations on substrate of perovskite solar cells is demonstrated. Faster chemical reaction between lead iodide and methyl ammonium iodide is observed in the corrugated devices. Optical field enhancements in the corrugated devices are confirmed with the finite‐difference time‐domain modeling and simulation. As a result, the perovskite solar cells fabricated on corrugated substrates show a 50% enhancement of power conversion efficiency compared to planar devices.