Enhanced photovoltage for inverted planar heterojunction perovskite solar cells

By Deying Luo, Wenqiang Yang, Zhiping Wang, A. Sadhanala, Qin Hu, Rui Su, Ravichandran Shivanna, G. Trindade, J. Watts, Zhaojian Xu and 14 more. Science, 2018

1,258 citations recorded by the source corpus.

Perovskite layers make the grade Inverted planar perovskite solar cells offer opportunities for a simplified device structure compared with conventional mesoporous titanium oxide interlayers. However, their lower open-circuit voltages result in lower power conversion efficiencies. Using mixed-cation lead mixed-halide perovskite and a solution-processed secondary growth method, Luo et al. created a surface region in the perovskite film that inhibited nonradiative charge-carrier recombination. This kind of solar cell had comparable performance to that of conventional cells. Science, this issue p. 1442 High open-circuit voltages were achieved for planar perovskite solar cells by creating a graded junction. The highest power conversion efficiencies (PCEs) reported for perovskite solar cells (PSCs) with inverted planar structures are still inferior to those of PSCs with regular structures, mainly because of lower open-circuit voltages (Voc). Here we report a strategy to reduce nonradiative recombination for the inverted devices, based on a simple solution-processed secondary growth technique. This approach produces a wider bandgap top layer and a more n-type perovskite film, which mitigates nonradiative recombination, leading to an increase in Voc by up to 100 millivolts. We achieved a high Voc of 1.21 volts without sacrificing photocurrent, corresponding to a voltage deficit of 0.41 volts at a bandgap of 1.62 electron volts. This improvement led to a stabilized power output approaching 21% at the maximum power point.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/1e6e0061d6371cbec31dac554e86c7cda28d852b

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In Electrical and Electronic Engineering

1. M. McGehee
2. Michael Saliba
3. Edward H. Sargent
4. A. Abate
5. Anyi Mei
6. T. Kirchartz
7. Yaoguang Rong
8. B. Rech

In Polymers and Plastics

1. Edward H. Sargent
2. Michael Saliba
3. A. Abate
4. M. McGehee
5. L. Korte
6. Anyi Mei
7. S. Albrecht
8. Yaoguang Rong

Citations in the corpus

• Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction (2020, methodology): “In recently published high-PCE p-i-n (“inverted”) single-junction and tandem PSCs, the polymer bis(4-phenyl)(2,4,6-trime-thylphenyl)amine] (PTAA) or the comparable Poly(N,N'-bis-4-butylphenyl-N,N'-bisphenyl)benzidine (polyTPD) are standardly used (10, 11, 37, 38).”
• Challenges for commercializing perovskite solar cells (2018, background): “Depending on the sequence of depositing the ETL andHTL, the structure can be divided into formal (conventional) versus inverted architectures (13, 14).”
• The perovskite/transport layer interfaces dominate non-radiative recombination in efficient perovskite solar cells (2018, background): “6 eV), which is among the highest reported values for pin-type cells (Supplementary Figure S10).(30)”