Measuring product carbon footprints from cradle to gate

Concerns about anthropogenic climate-change have led groups such as the Science-Based Targets Initiative to advocate for industry-specific emission reductions paths. Accordingly, many multinational firms have pledged achievement of net-zero greenhouse gas emissions by some target date, usually 2050. Such pledges, however, lack credibility without accurate and verifiable measurement of a company’s controllable carbon footprint

Strategy for large???scale monolithic Perovskite/Silicon tandem solar cell: A review of recent progress

For any solar cell technology to reach the final mass-production/commercialization stage, it must meet all technological, economic, and social criteria such as high efficiency, large-area scalability, long-term stability, price competitiveness, and environmental friendliness of constituent materials. Until now, various solar cell technologies have been proposed and investigated, but only crystalline silicon, CdTe, and CIGS technologies have overcome the threshold of mass-production/commercialization. Recently, a perovskite/silicon (PVK/Si) tandem solar cell technology with high efficiency of 29.1% has been reported, which exceeds the theoretical limit of single-junction solar cells as well as the efficiency of stand-alone silicon or perovskite solar cells. The International Technology Roadmap for Photovoltaics (ITRPV) predicts that silicon-based tandem solar cells will account for about 5% market share in 2029 and among various candidates, the combination of silicon and perovskite is the most likely scenario. Here, we classify and review the PVK/Si tandem solar cell technology in terms of homo- and hetero-junction silicon solar cells, the doping type of the bottom silicon cell, and the corresponding so-called normal and inverted structure of the top perovskite cell, along with mechanical and monolithic tandemization schemes. In particular, we review and discuss the recent advances in manufacturing top perovskite cells using solution and vacuum deposition technology for large-area scalability and specific issues of recombination layers and top transparent electrodes for large-area PVK/Si tandem solar cells, which are indispensable for the final commercialization of tandem solar cells

Holdups, Standard Breach Remedies, and Optimal Investment.

In bilateral trading problems, the parties may be hesitant to make relationship-specific investments without adequate contractual protection. The authors postulate that the parties can sign noncontingent contracts prior to investing and can freely renegotiate them after information about the desirability of trade is revealed. They find that such contracts can induce one party to invest efficiently when courts impose either a breach remedy of specific performance or expectation damages. Moreover, specific performance can induce both parties to invest efficiently if a separability condition holds. Expectation damages, on the other hand, is poorly suited to solve bilateral investment problems. Copyright 1996 by American Economic Association.