Efficient Ag-Doped Perovskite Solar Cells Fabricated in Ambient Air

Jiabin Hao,Huiying Hao,Jianyu Wang,Bing Pan,Guanlei Wang,Qiang Qi,Zeming Wang,Hongcheng Gao

doi:10.3390/cryst11121521

Abstract

So far, it is still a great challenge to prepare high efficiency organic–inorganic perovskite solar cells in ambient air. Specifically, moisture is easily combined with the perovskite material during the spin-coating process, which result in porous perovskite films with poor surface morphology. In this study, we investigated crystalline Ag-doped perovskite films by a one-step spin-coating method in air with 30–40% relative humidity (RH), in which ethyl acetate (EA) was used as antisolvent can absorb moisture in air to reduced nucleation density. More significantly, EA is a feasible and environmentally friendly solvent to replace highly toxic solvent. Moreover, 1.0% Ag-doped device shows a highest power conversion efficiency (PCE) of 14.36%. The improved performance is not only ascribed to the superior CH3NH3PbI3 film with high crystallinity but to the versatile tunability of energy band structure.

Highlights

Worldwide efforts have been made to continuously improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs) [1]
Can be identified with reflections peaks located at 2θ values of 14.20◦, 28.51◦, and 31.92◦ can be identified with reflections form (110), (220), and (310) planes, suggesting that the MAPbI3 films with tetragonal crysform (110), (220), and (310) planes, suggesting that the MAPbI3 films with tetragonal crystal tal structure were obtained in this study
An increase in diffraction intensity of of Ag-doped MAPbI3 materials can be observed in the patterns

Summary

Introduction

Worldwide efforts have been made to continuously improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs) [1]. High performance of PSCs can be attributed to excellent photoelectric property of high absorption coefficient, tunable band gap, and long charge carrier diffusion length [2,3,4]. It is inevitable that the composition of perovskite would affect optoelectronic properties including the light absorption, carrier transport property and the band gap. It has shown that tuning the energy band structure and properties of perovskite materials through a partial substitution of the divalent metal, such as Sn, Ca, or Ba [7,8,9], the monovalent cation (e.g., K, Na, Cu) or trivalent cation such as Bi or In for Pb [10,11,12,13]. It has been found that Ag-doped perovskite material MAPb1-x Agx I3 has a p-type conductive behavior by using the first-principles calculations [16]

Methods

Results

Conclusion