In Situ Back‐Contact Passivation Improves Photovoltage and Fill Factor in Perovskite Solar Cells
Abstract
Organic–inorganic hybrid perovskite solar cells (PSCs) have seen a rapid rise in power conversion efficiencies in recent years; however, they still suffer from interfacial recombination and charge extraction losses at interfaces between the perovskite absorber and the charge–transport layers. Here, in situ back‐contact passivation (BCP) that reduces interfacial and extraction losses between the perovskite absorber and the hole transport layer (HTL) is reported. A thin layer of nondoped semiconducting polymer at the perovskite/HTL interface is introduced and it is shown that the use of the semiconductor polymer permits—in contrast with previously studied insulator‐based passivants—the use of a relatively thick passivating layer. It is shown that a flat‐band alignment between the perovskite and polymer passivation layers achieves a high photovoltage and fill factor: the resultant BCP enables a photovoltage of 1.15 V and a fill factor of 83% in 1.53 eV bandgap PSCs, leading to an efficiency of 21.6% in planar solar cells.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 10, 2019
- Source ID
- 10.1002/adma.201807435
Entities
People
- Ahmad R Kirmani
- Anyi Mei
- Bowen Zhang
- Chih‐shan Tan
- Edward H. Sargent
- Feng Zhang
- Furui Tan
- Hairen Tan
- James Z. Fan
- Junghwan Kim
- Lee J. Richter
- Makhsud I Saidaminov
- Mengxia Liu
- Mingyang Wei
- Oleksandr Voznyy
- Peicheng Li
- Rafael Quintero‐bermudez
- Weifeng Zhang
- Xiwen Gong
- Yicheng Zhao
- Yongbiao Zhao
- Yueyue Gao
- Zheng‐hong Lu
- Ziru Huang
Organizations
- China Scholarship Council
- Dutch Research Council
- Henan University
- Nanjing University
- National Institute of Standards and Technology
- National Natural Science Foundation of China
- Natural Science Foundation of Henan Province
- Natural Sciences and Engineering Research Council
- Office of Naval Research
- United States Department of Energy
- University of Toronto