Improving Photovoltaic Performance Using Perovskite/Surface-Modified Graphitic Carbon Nitride Heterojunction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Article number1900413
Journal / PublicationSolar RRL
Publication statusOnline published - 23 Nov 2019

Abstract

Passivation strategies are considered as one of the most efficient methods to suppress nonradiative recombination of organic-inorganic lead halide perovskite solar cells (PSCs), leading to tremendous photovoltaic performance. An innovative 2D polymer, graphitic carbon nitride (g-C3N4), as well as various organic groups (amino, sulfonic, nitrato, and hydroxy group), are widely used as passivation agents, according to the previous reports. Anchoring g-C3N4 and the aforementioned organic groups as additives in perovskite can both heal charged defects around the grain boundaries by passivating the charge recombination center. In addition, the crystalline quality can also be enhanced by the incorporation of g-C3N4, leading to improved conductivity of perovskite light absorber films that is beneficial for benign charge extraction efficiency. Inspired by the underlining mechanisms, a series of novel passivation molecules, functionalized g-C3N4 (F-C3N4) with assorted organic groups, is designed herein, yielding a champion power conversion efficiency (PCE) of 20.08% for NO3-C3N4-based p-i-n structure PSC, in comparison with that of PSC without passivation (17.85%). These findings present an efficient strategy to understand and design multiple facets of applications of novel passivation molecules to further improve the PCE of PSCs.

Research Area(s)

  • modified graphitic carbon nitrides, perovskite solar cells, surface passivation, SOLAR-CELLS, DEFECT PASSIVATION